=> R1 = &46 (reason code)
R2 = mode number
<= see below
This service allows a module to object to a mode change, or subsitute a different mode:
Case 1 - module has no objection
<= R1,R2 preserved (pass on)
Case 2 - module objects, and takes alternative action
<= R1 = 0 (claim service)
R2 = 0
Case 3 - module objects, and returns an error
<= R0 = pointer to error block
R1 = 0 (claim service)
Case 4 - module wishes to subsitute an alternative mode
<= R1 = &46 (reason code) - pass on
R2 = new mode number
Service_ModeTranslation offers a better method to support new monitor types.
See PRM 1, page 618
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