>>WM_HELP, is sent if ON('KEY', 'F1') = 'HELP'. If it's own error dialogs, then VFP wouldn't necessarily be using WM_HELP. I can't find what message VFP sends to activate it's help, but pressing F1 does generate a WM_HELP message that VFP processes if no dialog is present.
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>I couldn't get VFP to do this. Were you looking at the main window or one of VFP's child windows (or one of its extraneous windows)?

Sorry, I missed this. I wasn't looking at the window. I was looking at the process.