R0 = Task handle
R1 = Wimp_Poll block
R2 = Wimp_Poll reason code
Exit:
R0 = Wimp_Poll reason code (possibly altered)
To be called immediately after Wimp_Poll, to
perform actions such as slabbing icons and
changing pointers. WimpExtension may alter
the code returned - eg. if the user clicks in
a requester window then the code will be
translated before your program gets to see it.
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