|Use:||This is issued as soon as RISC-OS
reaches a point where it executes its transient callbacks (ie; in SVC mode
usually) after the interrupt notifying the MouseSync module of a change in
mouse pointer position or wheel position.
It was intended to use this service call to implement your own mouse driver or wheel motion translator. To override the default action of setting the position of the mouse using OS_Word, claim the service call.