=> R0 = Event reason code being returned for Post filters
R1 = User's event buffer
R2 = Task handle of task that called Wimp_Poll
R3 = Pointer to poll word if applicable
R12 = Value of R2 when filter registered
<= You may modify the reason code in R0 and the contents of the buffer pointed to by R1 to provide a new event.
Return R0 = -1 to prevent event being passed to task.
You must preserve all other registers.
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