>I did use Spy++ and when a user presses F1 or uses the Help menu option, no WM_HELP message is sent to VFP or any other window that I can find. F1 causes a WM_ACTIVATEAPP message to be sent that initiates the help.

Is this in VFP or with a dialog from MessageBoxEx()? My thought here is that WM_HELP is normally sent to either the the window that has keyboard focus (with MessageBoxEx() the dialog would be the window) or the currently active window if no window has keyboard focus. Undoubtedly, clicking the help button on the dialog generates this message. The question would seem to be does the receiving window know how to process it? VFP's handling of windows messages is non-standard, so...