DtHelpDialog(library call)                          DtHelpDialog(library call)



NAME
       DtHelpDialog -- DtHelpDialog widget class

SYNOPSIS
       #include &<Dt/HelpDialog.h>

DESCRIPTION
       The DtHelpDialog widget provides users with functionality for viewing
       and navigating structured online information (XCDE help volumes). This
       functionality includes text and graphics rendering, embedded hypertext
       links and various navigation methods to move through online help
       information. The widget supports rendering of XCDE help volumes, system
       manual pages, text files and character string values.

       When the user resizes the window, the DtHelpDialog widget dynamically
       reformats its contents to fit the new window size if the DtNhelpType of
       the contents is DtHELP_TYPE_TOPIC or DtHELP_TYPE_DYNAMIC_STRING. If the
       DtNhelpType of the contents is DtHELP_TYPE_STRING, DtHELP_TYPE_MAN_PAGE
       or DtHELP_TYPE_FILE, the contents are not reformatted. Instead, scroll
       bars may appear when the user resizes the window smaller than the help
       contents. The exact scrollbar behavior is controlled by the
       DtNscrollBarPolicy resource.

       Users can re-specify certain resources for the automatically created
       widgets and gadgets contained within the DtHelpDialog widget hierarchy.
       The following list identifies the names of these widgets (or gadgets):

          o  Topic Tree - TocArea

          o  Display Area - DisplayArea

          o  Button Box - BtnBox

       The DtHelpDialog widget honors all default and user-specified resource
       settings, with one exception. In the case where an error occurs due to
       an invalid request, the DtHelpDialog widget posts the proper error
       message in its display area and modifies the DtNhelpType resource to
       reflect the current contents of the display area (that is, a string
       message). Applications and users should set the DtNhelpType resource to
       the appropriate value with each setting of the DtHelpDialog widget.

   Classes
       The DtHelpDialog widget inherits behavior and resources from the Core,
       Composite, Constraint, XmManager and XmBulletinBoard classes.

       The class pointer is dtHelpDialogClass.

       The class name is DtHelpDialog.

   New Resources
       To reference a resource by name or by class in a .Xdefaults file, the
       application must remove the DtN or DtC prefix and use the remaining
       letters. To specify one of the defined values for a resource in a
       .Xdefaults file, the application must remove the Dt prefix and use the
       remaining letters (in either lower case or upper case, but including
       any underscores between words). The codes in the access column indicate
       if the given resource can be set at creation time (C), set by using
       XtSetValues (S), retrieved by using XtGetValues (G), or is not
       applicable (N/A).

       DtHelpDialog Resource

       Set
       Name                      Class                  Type             Default                          Access
       DtNcloseCallback          DtCCloseCallback       XtCallbackList   NULL                             C
       DtNcolumns                DtCColumns             Dimension        70                               CSG
       DtNexecutionPolicy        DtCExecutionPolicy     unsigned char    DtHELP_EXECUTE_QUERY_UNALIASED   CSG
       DtNhelpFile               DtCHelpFile            char *           NULL                             CSG
       DtNhelpOnHelpVolume       DtCHelpOnHelpVolume    char *           See Definition                   C
       DtNhelpPrint              DtCHelpPrint           char *           See Definition                   CSG
       DtNhelpType               DtCHelpType            unsigned char    See Definition                   CSG
       DtNhelpVolume             DtCHelpVolume          char *           NULL                             CSG
       DtNhyperLinkCallback      DtCHyperLinkCallback   XtCallbackList   NULL                             C
       DtNlocationId             DtCLocationId          char *           See Definition                   CSG
       DtNmanPage                DtCManPage             char *           NULL                             CSG
       DtNpaperSize              DtCPaperSize           unsigned char    See Definition                   C
       DtNprinter                DtCPrinter             char *           NULL                             CSG
       DtNrows                   DtCRows                Dimension        25                               CSG
       DtNscrollBarPolicy        DtCScrollBarPolicy     unsigned char    See Definition                   C
       DtNstringData             DtCStringData          char *           NULL                             CSG
       DtNtopicTitle             DtCTopicTitle          char *           NULL                             CSG
       DtNvisiblePathCount       DtCVisiblePathCount    int              7                                C
       tgroup dispwid="7.63in"

       DtNcloseCallback
                 Specifies the list of callbacks called when the user
                 activates the Close button. The callback reason is
                 DtCR_HELP_CLOSE.

       DtNcolumns
                 Specifies the number of columns of text to display in the
                 display area of the DtHelpDialog widget.

       DtNexecutionPolicy
                 Specifies how to handle ``Execute'' hypertext link types and
                 embedded scripts.  The default value is set to
                 DtHELP_EXECUTE_QUERY_UNALIASED and supports different
                 semantics based on the usage of a command alias.  Refer to
                 the XCDE Help System Author's and Programmer's Guide for more
                 information on command alias usage.  With the default value
                 and no command alias, a query dialog will be posted upon user
                 selection of an execute hypertext link.  The dialog will show
                 the command that has been specified and give the user the
                 option to ``Execute Anyway,'' ``Don't Execute'' or request
                 help for more information.  When a command alias is present
                 for the selected link, the command will execute silently, and
                 no query dialog will be posted.

                 Other values for this resource are DtHELP_EXECUTE_NONE,
                 DtHELP_EXECUTE_ALL and DtHELP_EXECUTE_QUERY_ALL.
                 DtHELP_EXECUTE_NONE forces all execute hypertext links to be
                 ignored.  DtHELP_EXECUTE_ALL allows all execute hypertext
                 links to be executed silently upon link selection by the
                 user, and DtHELP_EXECUTE_QUERY_ALL forces the query dialog to
                 be posted with every link invocation.

       DtNhelpFile
                 Specifies the absolute pathname of a text file to be read and
                 displayed.  This resource is used when the DtNhelpType is set
                 to DtHELP_TYPE_FILE.

       DtNhelpOnHelpVolume
                 Specifies the help volume that contains the help topics for
                 the help user-interface components in the widget. This is
                 displayed in an instance of the DtHelpDialog widget when the
                 user requests help from within the widget.  The default value
                 for this resource is Help4Help, which refers to the default-
                 supported help volume. This resource supports absolute
                 pathnames and pathless help volume names. When just a volume
                 name is used, the volume must be placed or linked to one of
                 the default search locations, or one of the two help search
                 path environment variables must be properly set. See the
                 ENVIRONMENT VARIABLES section for more information on setting
                 and modifying these variables.

       DtNhelpPrint
                 Specifies the location of the dthelpprint(1) utility used to
                 print help topics, manual-page files or help messages from
                 the DtHelpDialog widget.  This value defaults to
                 /usr/local/dt/bin/dthelpprint.

       DtNhelpType
                 Specifies the current topic type. When the value is
                 DtHELP_TYPE_TOPIC, the DtNlocationId and DtNhelpVolume
                 resources are used and the requested help topic is displayed.
                 When the value is DtHELP_TYPE_STRING or
                 DtHELP_TYPE_DYNAMIC_STRING, the DtNstringData resource is
                 used and the requested string is displayed. When the value is
                 DtHELP_TYPE_FILE, the DtNhelpFile resource is used and the
                 requested text file is displayed. When the value is
                 DtHELP_TYPE_MAN_PAGE, the DtNmanPage resource is used and the
                 requested system manual page is displayed. The initial
                 default value is DtHELP_TYPE_TOPIC; however, each time there
                 is a request to display a help topic, text file, manual page
                 or text string, the user should reset DtNhelpType to the
                 proper type.

       DtNhelpVolume
                 Specifies the help volume to use. This resource is used in
                 conjunction with the DtNlocationId resource to display help
                 topics. This resource supports absolute pathnames and
                 pathless help volume names. When using just a volume name,
                 the volume must be placed in or linked to one of the default
                 search locations, or one of the two help search path
                 environment variables must be properly set. See the
                 ENVIRONMENT VARIABLES section for more information on setting
                 and modifying these variables.

       DtNhyperLinkCallback
                 Specifies the callback that is called when a client-specific
                 hypertext link is activated in the display area of the
                 DtHelpDialog widget. Links are activated when the user
                 presses mouse button 1 over a hypertext link, or presses
                 <return> with the keyboard focus on the hypertext link item.
                 The callback reason is DtCR_HELP_LINK_ACTIVATE.
                 DtNhyperLinkCallback allows applications to register a
                 callback procedure that is used to process one of four
                 hypertext link types: DtHELP_LINK_APP_DEFINE,
                 DtHELP_LINK_TOPIC, DtHELP_LINK_MAN_PAGE or
                 DtHELP_LINK_TEXT_FILE. For DtHELP_LINK_TOPIC, the callback is
                 made only when the windowHint value in the callback structure
                 is DtHELP_NEW_WINDOW.

       DtNlocationId
                 Specifies a help topic to display. Applications reference
                 topics within a help volume using a location ID. Location IDs
                 are author-defined at help volume creation time. Applications
                 use these location IDs to display the desired help topic. The
                 default value for this resource is _HOMETOPIC, which refers
                 to the help volume's top level topic. DtNhelpVolume must be
                 set to the help volume in which the corresponding location ID
                 resides, and DtNhelpType must be set to DtHELP_TYPE_TOPIC.

       DtNmanPage
                 Specifies the system manual page to display in the current
                 DtHelpDialog widget. This resource is used when the
                 DtNhelpType is set to DtHELP_TYPE_MAN_PAGE.

       DtNpaperSize
                 Controls the value used in the Help-Print dialog for paper
                 size.  The default value is set to DtHELP_PAPERSIZE_LETTER.
                 Other supported values for this resource are:
                 DtHELP_PAPERSIZE_LEGAL, DtHELP_PAPERSIZE_EXECUTIVE,
                 DtHELP_PAPERSIZE_A4, DtHELP_PAPERSIZE_B5.

       DtNprinter
                 Specifies the printer name to be used when printing within
                 the DtHelpDialog widget.  If the value is NULL, the default
                 value is taken from the LPDEST environment variable.

       DtNrows   Specifies the number of rows of text to display in the
                 display area of the DtHelpDialog widget.

       DtNscrollBarPolicy
                 Controls the automatic placement of scroll bars in the text
                 display area. If it is set to DtHELP_AS_NEEDED_SCROLLBARS,
                 the scroll bars are displayed only if the display area
                 exceeds the clip area in one or both dimensions. A resource
                 value of DtHELP_STATIC_SCROLLBARS causes the display area to
                 display the scroll bars whenever the DtHelpDialog widget is
                 managed, regardless of the relationship between the clip
                 window and the display area. A value of DtHELP_NO_SCROLLBARS
                 removes scroll bars from the DtHelpDialog widget. The default
                 value is DtHELP_AS_NEEDED_SCROLLBARS.

       DtNstringData
                 Specifies the string data (char *) to display in the current
                 DtHelpDialog widget. This resource is used when the
                 DtNhelpType is set to DtHELP_TYPE_STRING.

       DtNtopicTitle
                 Specifies the topic title (char *) to be used in conjunction
                 with either the DtNstringData or DtNhelpFile resource. The
                 topic title is required in order to maintain an accurate and
                 descriptive history list. The topic title is also used as the
                 default heading for the banner page and page header when
                 printing. When printing help topics, this resource may be
                 ignored.

       DtNvisiblePathCount
                 Specifies the number of items to display in the topic tree
                 area of the widget.

   Inherited Resources
       The DtHelpDialog widget inherits behavior and resources from the
       following named superclasses. For a complete description of each
       resource, see the man page for that superclass.

       XmBulletinBoard
       Resource Set
       Name                      Class                Type             Default        Access
       XmNallowOverlap           XmCAllowOverlap      Boolean          True           CSG
       XmNautoUnmanage           XmCAutoUnmanage      Boolean          True           CG
       XmNbuttonFontList         XmCButtonFontList    XmFontList       dynamic        CSG
       XmNcancelButton           XmCWidget            Widget           dynamic        SG
       XmNdefaultButton          XmCWidget            Widget           dynamic        SG
       XmNdefaultPosition        XmCDefaultPosition   Boolean          True           CSG
       XmNdialogStyle            XmCDialogStyle       unsigned char    dynamic        CSG
       XmNdialogTitle            XmCDialogTitle       XmString         NULL           CSG
       XmNfocusCallback          XmCCallback          XtCallbackList   NULL           C
       XmNlabelFontList          XmCLabelFontList     XmFontList       dynamic        CSG
       XmNmapCallback            XmCCallback          XtCallbackList   NULL           C
       XmNmarginHeight           XmCMarginHeight      Dimension        10             CSG

       XmNmarginWidth            XmCMarginWidth       Dimension        10             CSG
       XmNnoResize               XmCNoResize          Boolean          False          CSG
       XmNresizePolicy           XmCResizePolicy      unsigned char    XmRESIZE_ANY   CSG
       XmNshadowType             XmCShadowType        unsigned char    XmSHADOW_OUT   CSG
       XmNtextFontList           XmCTextFontList      XmFontList       dynamic        CSG
       XmNtextTranslations       XmCTranslations      XtTranslations   NULL           C
       XmNunmapCallback          XmCCallback          XtCallbackList   NULL           C
       tgroup dispwid="7.66in"

       XmManager Resource
       Set
       Name                      Class                   Type                 Default                Access
       XmNbottomShadowColor      XmCBottomShadowColor    Pixel                dynamic                CSG
       XmNbottomShadowPixmap     XmCBottomShadowPixmap   Pixmap               XmUNSPECIFIED_PIXMAP   CSG
       XmNforeground             XmCForeground           Pixel                dynamic                CSG
       XmNhelpCallback           XmCCallback             XtCallbackList       NULL                   C
       XmNhighlightColor         XmCHighlightColor       Pixel                dynamic                CSG
       XmNhighlightPixmap        XmCHighlightPixmap      Pixmap               dynamic                CSG
       XmNinitialFocus           XmCInitialFocus         Widget               dynamic                CSG
       XmNnavigationType         XmCNavigationType       XmNavigationType     XmTAB_GROUP            CSG
       XmNshadowThickness        XmCShadowThickness      Dimension            dynamic                CSG
       XmNstringDirection        XmCStringDirection      XmString-Direction   dynamic                CG
       XmNtopShadowColor         XmCTopShadowColor       Pixel                dynamic                CSG
       XmNtopShadowPixmap        XmCTopShadowPixmap      Pixmap               dynamic                CSG
       XmNtraversalOn            XmCTraversalOn          Boolean              True                   CSG
       XmNunitType               XmCUnitType             unsigned char        dynamic                CSG
       XmNuserData               XmCUserData             XtPointer            NULL                   CSG
       tgroup dispwid="7.84in"

       Composite Resource
       Set
       Name                      Class               Type          Default    Access
       XmNchildren               XmCReadOnly         WidgetList    NULL       G
       XmNinsertPosition         XmCInsertPosition   XtOrderProc   NULL       CSG
       XmNnumChildren            XmCReadOnly         Cardinal      0          G
       tgroup dispwid="7.46in"

       Core Resource Set
       Name                            Class                           Type             Default                Access
       XmNaccelerators                 XmCAccelerators                 XtAccelerators   dynamic                N/A
       XmNancestorSensitive            XmCSensitive                    Boolean          dynamic                G
       XmNbackground                   XmCBackground                   Pixel            dynamic                CSG
       XmNbackgroundPixmap             XmCPixmap                       Pixmap           XmUNSPECIFIED_PIXMAP   CSG
       XmNborderColor                  XmCBorderColor                  Pixel            XtDefaultForeground    CSG
       XmNborderPixmap                 XmCPixmap                       Pixmap           XmUNSPECIFIED_PIXMAP   CSG
       XmNborderWidth                  XmCBorderWidth                  Dimension        0                      CSG
       XmNcolormap                     XmCColormap                     Colormap         dynamic                CG
       XmNdepth                        XmCDepth                        int              dynamic                CG
       XmNdestroyCallback              XmCCallback                     XtCallbackList   NULL                   C
       XmNheight                       XmCHeight                       Dimension        dynamic                CSG
       XmNinitialResourcesPersistent   XmCInitialResourcesPersistent   Boolean          True                   C
       XmNmappedWhenManaged            XmCMappedWhenManaged            Boolean          True                   CSG
       XmNscreen                       XmCScreen                       Screen *         dynamic                CG
       XmNsensitive                    XmCSensitive                    Boolean          True                   CSG
       XmNtranslations                 XmCTranslations                 XtTranslations   dynamic                CSG
       XmNwidth                        XmCWidth                        Dimension        dynamic                CSG
       XmNx                            XmCPosition                     Position         0                      CSG
       XmNy                            XmCPosition                     Position         0                      CSG
       tgroup dispwid="7.90in"

   Callback Information
       A pointer to the following structure is passed to each callback:

       typedef struct {
               int     reason;
               XEvent  *event;
               char    *locationId;
               char    *helpVolume;
               char    *specification;
               int     hyperType;
               int     windowHint;
       } DtHelpDialogCallbackStruct;

       The reason argument indicates why the callback was invoked.

       The event argument points to the XEvent that triggered the callback.

       The locationId argument indicates the DtNlocationId for the current
       topic. This value is NULL whenever the hyperType value is not
       DtHELP_LINK_TOPIC or DtHELP_LINK_APP_DEFINE.

       The helpVolume argument indicates the current help volume. This value
       is NULL whenever the hyperType value is not DtHELP_LINK_TOPIC or
       DtHELP_LINK_APP_DEFINE.

       The specification argument indicates any author-defined data that was
       contained within the hypertext link selected. This value returns NULL
       if no author-defined data was given. For hyperlinks of type
       DtHELP_MAN_PAGE, the specification argument contains the name of the
       manual page. For hyperlinks of type DtHELP_LINK_TEXT_FILE, the
       specification argument contains that name of the file.

       The hyperType argument indicates the hypertext link type. Possible
       values are: DtHELP_LINK_TOPIC, DtHELP_LINK_MAN_PAGE,
       DtHELP_LINK_APP_DEFINE or DtHELP_LINK_TEXT_FILE.

       The windowHint argument indicates a hint for the type of window (quick
       help, existing or new window) to use. This value contains one of the
       following three types: DtHELP_POPUP_WINDOW, DtHELP_CURRENT_WINDOW or
       DtHELP_NEW_WINDOW.

   Additional Behavior
       The DtHelpDialog widget has the additional behavior described below:

       &<MAny> &<KCancel>
                 Calls the active callbacks for the Close button. If a
                 &<BDrag> for either a selection or scrollbar movement is in
                 process, the &<KCancel> aborts that action.

       &<KSpace>, &<KActivate> or &<BSelect> in Topic Tree Text
                 Opens the help topic currently selected, displays that topic
                 in the display area and updates the topic tree to match the
                 newly displayed topic.

       &<KSpace>, &<KActivate> or &<BSelect> in Display Area Text
                 Invokes the hypertext link that contains the current
                 selection.

       &<DoubleClick> in Topic Tree or
                 Display Area Text" 10 Ignored.

       &<BDrag> in Topic Tree or Display
                 Area Text" 10 Selects the text from the drag start point to
                 the drag end point. Moving and holding the &<BDrag> outside
                 the topic tree or display area scrolls the window, selecting
                 the newly exposed text.

       &<MCtrl> or &<MShift>
                 &<BSelect> in Topic Tree Text" 10

       &<MCtrl> &<KSpace> in Topic Tree
                 Text" 10

       &<MCtrl> &<KActivate> in Topic
                 Tree Text" 10 Invokes the DtNhyperLinkCallback for the
                 DtHelpDialog widget, setting the helpType to
                 DtHELP_LINK_TOPIC, the windowHint to DtHELP_NEW_WINDOW, the
                 helpVolume to the current volume name and the locationId to
                 the selected item's location ID. If no DtNhyperLinkCallback
                 is supplied, the action is ignored.

       &<MCtrl> or &<MShift>
                 &<BSelect> in Display Area Hypertext Link Text" 10 Invokes
                 the DtNhyperLinkCallback for the DtHelpDialog widget,
                 honoring all existing link settings, but forces the
                 windowHint to DtHELP_NEW_WINDOW. If no DtNhyperLinkCallback
                 is supplied, the hypertext link is handled internally.

       &<KSelectAll> in Display Area or
                 Topic Tree" 10 Selects all text within the topic tree area or
                 display area.

       &<KDeSelectAll> in Display Area
                 or Topic Tree" 10 Deselects all text within the topic tree
                 area or display area.

       &<KUp> or &<KLeft> in Display Area or Topic Tree
                 Moves the traversal highlight up or left to the next
                 hypertext link item.

       &<KDown> or &<KRight> in Display Area or Topic Tree
                 Moves the traversal highlight down or right to the next
                 hypertext item.

       &<KCopy> in the Display Area or
                 Topic Tree" 10 Copies the currently selected text to the
                 clipboard.

       &<KPageDown> or &<MCtrl>
                 &<KDown> in Display Area or Topic Tree" 10 Displays the next
                 page of text.

       &<KPageLeft> or &<MCtrl>
                 &<KLeft> in Display Area or Topic Tree" 10 Scrolls the
                 information to the left.

       &<KPageRight> or &<MCtrl>
                 &<KRight> in Display Area or Topic Tree" 10 Scrolls the
                 information to the right.

       &<KPageUp> or &<MCtrl>
                 &<KUp> in Display Area or Topic Tree" 10 Displays the
                 previous page of information.

       &<KBeginData> in the Display Area
                 or Topic Tree" 10 Displays the first page of information.

       &<KEndData> in the Display Area
                 or Topic Tree" 10 Displays the last page of information.

   Virtual Bindings
       The bindings for virtual keys are implementation-dependent. For
       information about bindings for virtual buttons and keys, see
       VirtualBindings(3).

ENVIRONMENT VARIABLES
       The DtHelpDialog widget uses two environment variables for locating
       help volumes within the desktop environment:

       DTHELPSEARCHPATH
                 The system search path environment variable for locating help
                 volumes on local and remote NFS mounted systems.

       DTHELPUSERSEARCHPATH
                 The search path environment variable for locating user-
                 specific help volumes on local and remote NFS mounted
                 systems.

       The environment variables contain colon-separated lists of directory
       paths. Each directory path can contain both environment variable names
       as well as special field descriptors that are expanded at runtime.

       Field descriptors consist of a percent-sign character (%) followed by a
       single character. Field descriptors and their substitution values are:

       %H        Replaced with the current volume name being searched for.

       %L        Replaced with the current value of the LANG environment
                 variable.

       %%        Replaced with a single %.

       The default value for DTHELPUSERSEARCHPATH is:

       $HOME/.dt/help/$DTUSERSESSION/%H:
       $HOME/.dt/help/$DTUSERSESSION/%H.sdl:
       $HOME/.dt/help/$DTUSERSESSION/%H.hv:
       $HOME/.dt/help/%H:
       $HOME/.dt/help/%H.sdl:
       $HOME/.dt/help/%H.hv

       The DTHELPUSERSEARCHPATH is first searched for the requested volume. If
       the volume is not found, the DTHELPSEARCHPATH value is searched.

       The default value for DTHELPSEARCHPATH path is:

       /etc/dt/appconfig/help/%L/%H:
       /etc/dt/appconfig/help/%L/%H.sdl:
       /etc/dt/appconfig/help/%L/%H.hv:
       /etc/dt/appconfig/help/C/%H:
       /etc/dt/appconfig/help/C/%H.sdl:
       /etc/dt/appconfig/help/C/%H.hv:
       /usr/local/dt/appconfig/help/%L/%H:
       /usr/local/dt/appconfig/help/%L/%H.sdl:
       /usr/local/dt/appconfig/help/%L/%H.hv:
       /usr/local/dt/appconfig/help/C/%H:
       /usr/local/dt/appconfig/help/C/%H.sdl:
       /usr/local/dt/appconfig/help/C/%H.hv

APPLICATION USAGE
       The following messages can be generated as a result of an error or
       improperly set resource value in the DtHelpDialog widget.  These
       messages are displayed in the widget's display area as well as standard
       error.

   Error Messages
       String data could not be formatted.
                 The error occurred when formatting help information of type
                 DtHELP_TYPE_STRING.

       Dynamic string data could not be formatted.
                 The error occurred when formatting help information of type
                 DtHELP_TYPE_DYNAMIC_STRING.

       Man Page could not be formatted. The requested man page

       is either not present, or corrupt.
                 The error occurred when formatting help information of type
                 DtHELP_TYPE_MAN_PAGE.

       Text file could not be formatted. The requested text file

       is either not present, or corrupt.
                 The error occurred when formatting help information of type
                 DtHELP_TYPE_FILE.

       Non-supported DtNhelpType value used.
                 The application used a non-supported DtNhelpType.

       Help topic could not be formatted.
                 The application attempted to access a corrupt runtime help
                 file.

       No DtNhyperLinkCallback supplied for widget.
                 A hypertext link of type DtHELP_NEW_WINDOW has been selected,
                 but the application has not supplied a hypertext callback to
                 handle it.  The link is handled like a DtHELP_CURRENT_WINDOW
                 jump.

       Nonexistent DtNlocationId.
                 The requested DtNlocationId is not present in the current
                 help volume.

       No DtNhyperLinkCallback supplied for widget.
                 A hypertext link of type DtHELP_LINK_APP_DEFINE or
                 DtHELP_LINK_MAN_PAGE is selected, but the application has not
                 supplied a hypertext callback to handle these link types.

       Could not find DtNhelpVolume.
                 The Help System is unable to find the help volume requested.

       Could not open DtNhelpVolume.
                 The Help System found the requested help volume, but does not
                 have the permission to open it.

SEE CaretALSO
       Dt/HelpQuickD.h - DtHelpQuickD(5), Dt/Help.h - DtHelp(5),
       DtCreateHelpQuickDialog(3), DtHelpSetCatalogName(3); XmManager(3),
       XmBulletinBoard(3), Core(3), Composite(3), Constraint(3),
       dthelptagdtd(4).



OpenBSD                                             DtHelpDialog(library call)
