+ 20 Mouse x
+ 24 Mouse y
+ 28 Button state
+ 32 Window handle, or -1 if no window
+ 36 Icon handle, or -1 if no icon
The !Help application sends out this message.
If you want to give some simple help on the given window/icon, then reply with a HelpReply message.
See PRM 3, page 244.
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