=> R0 = Reason code, see Wimp_Poll
R1 = Pointer to message block
R2 = Handle of destination task
or Window handle
or -2, and R3 = icon handle
or 0 to broadcast.
<= R0 corrupt
R2 = handle of destination task, if not broadcast
Message block my_ref (+8) and sender (+4) updated.
Most often, this SWI is used to send user messages. Sending an Acknowledge (R0 = 19) to a window allows its owner's task handle to be found.
Note: In versions of the Window Manager prior to 4.00, message blocks in dynamic areas (high address) will not have their sender and my_ref fields filled.
See also: PRM 3-196.
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