=> R1 = &49 (reason code)
<= R0 & R1 preserved to pass on else
R0 = pointer to command to start module
R1 = 0 (to claim service)
This service is issued by the Wimp to start up resident module tasks by passing the returned command to Wimp_StartTask. Module tasks which wish to start should claim this service, passing their start command in R0. The Wimp will re-issue this service until no more modules claim it.
Filer module tasks should wait for Service_StartFiler instead.
To prevent infinite loops if an error occurs in starting a task, modules should:
1 set their taskhandle to 0 on initialise, Service_Reset or Service_StartedWimp
2 only claim this service if their taskhandle is zero (i.e. they are not already running, and not attempting to re-start)
3 set their taskhandle to a flag value (-1) when they claim this service
4a set their taskhandle based on the return result of Wimp_Initialise if their command is called
4b or set their taskhandle back to 0 on Service_StartedWimp (failed to initialise)
5 set their taskhandle back to 0 when they quit using Wimp_CloseDown
See PRM 3, page 70
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