Stan writes:
 
>BTW: I submitted an enhancement request years ago to allow "SYS" to
>be a valid synonym for "MPEXL_SYSTEM_VOLUME_SET" ...
>it got lost.
 
Stan, thanks for the "$SYS" suggestion.  We didn't lose it:  it's in our
POSIX-compatable version 5.02 of BACKUP+/iX :-).