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The purpose of this call is to set the processor to User mode.
Interrupt and Fast Interrupt status is unaltered.
The advantage of this call is that it will cause callbacks to occur which can massively improve applications where only a quick bit of work is required in supervisor mode, yet it may be some time before any callbacks are triggered.
The This CallASWI module (version 0.03) allows thisSWI to was be introduced used withRISC OS pre 5.00. For older machines, theCallASWI module (version 0.10) provides an implementation of the SWI.
See also OS_EnterOS.