=> R0 = 0 (flags as in Message_SaveDesktop - currently all reserved)
R1 = &5C (reason code)
R2 = file handle of desktop file being written
<= R0 = pointer to error block, or preserve if not claimed
R1 = 0 to claim, or preserved to pass on
R2 preserved
This service is issued before Message_SaveDesktop to allow modules to save state to a desktop boot file in the form of *Commands. It should only be claimed if an error occurs.
See PRM 3, page 78
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