This prevents a broadcast message from being passed on, and a UserMessage_Recorded from being returned to the sender.
call Wimp_SendMessage with :
=> your_ref = 0 if finding task handle of a window/icon
otherwise it should be copied from the my_ref field
R0 = 19 (poll code)
R2 = task/window handle
R3 = icon handle if R2 = -2
<= R2 = task handle.
You can also use this if you only want to find out who owns a window or an icon on the iconbar.
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