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#define INCL_WINHELP
 
HM_EXT_HELP_UNDEFINED
 
The HM_EXT_HELP_UNDEFINED message notifies the application that an extended
help panel is not defined for the active window.
 
This message does not use any parameters.
 
Return Value
 
An application should return zero if it processes this message.
 
Comments
 
The system displays extended help only if the help table for the help
instance specifies a help-panel ID that corresponds to the active window.
(For example, the idExtPanel in the HELPTABLE structure used with the
WinCreateHelpInstance function must be set to a valid help-panel ID.) If the
help table specifies zero for the extended help-panel ID, the system sends
the HM_EXT_HELP_UNDEFINED message to the application. In this case, the
application should carry out some default action, such as displaying an
error message or using the HM_DISPLAY_HELP message to display a help panel.
 
See Also
 
HM_DISPLAY_HELP, HM_EXT_HELP, HELPTABLE
 
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