=> R0 = 0 if closing down, or > 0 if starting new task
R1 = &53 (reason code)
R2 = task handle
<= R0 preserved, or set to error block to stop start up
This service is called when a task exits using Wimp_CloseDown, or when Wimp_Initialise is called from within a task that is already initialised. If a task exits without calling Wimp_CloseDown, or if an error occurs and the task does not trap it then the Wimp will call this service so that it still has a chance to shut any jobs it may have active currently.
If the 'starting task' form of this service is called then the usual response is to return an error similar to 'Wimp is currently active' (the command line does this) in R0 when returning.
The DDEUtils module uses this service to trap when a task for which a prefix has been set is exiting.
See PRM 3, page 75
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