formhelp UseF1 property
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Applies to
acFormHelp component.  

property UseF1: Boolean;  

The UseF1 property specifies whether the FormHelp should invoke the context-sensitive help from the control under mouse pointer when user press F1 key.  
Set UseF1 to True to let the FormHelp to process F1 key presses, or set it to False to disable this feature.