The functions return one of the following error values:
E_OK
The function was successful.
E_SYSTEM_ERROR
There was a system error during the call.
E_BAD_ARGUMENT
One or more of the arguments passed to the function was incorrect.
E_POSTED
The menu is already posted.
E_CONNECTED
An item was already connected to a menu.
E_BAD_STATE
The function was called from within an initialization or termination routine.
E_NO_ROOM
The menu does not fit within the subwindow.
E_NOT_POSTED
The menu is not posted.
E_UNKNOWN_COMMAND
The menu driver does not recognize the request passed to it.
E_NO_MATCH
The character search failed to find a match.
E_NOT_SELECTABLE
The item could not be selected.
E_NOT_CONNECTED
The item is not connected to a menu.
E_REQUEST_DENIED
The menu driver could not process the request.