MTACC is a simple replacement for the VMS V5.x SYS$MTACCESS system service. Its initial reason for creation was to get around the "feature" in HSC BACKUP where an unfriendly accessibility code was written in the VOL1 label on the tape, making the tape unmountable by VMS BACKUP. Sure, you could mount the first reel with /OVERRIDE=ACCESSIBILITY, but BACKUP won't do that when it mounts the 2nd through Nth reels. To get around this problem, this version of $MTACCESS allows dynamically ignoring any accessibility field constraints, using the SYSGEN dynamic parameter USERD1 to control whether or not the access control bypass is enabled or not (this allows the system managers to turn off the override after they are done with it, without having to reboot the system). Obviously, this could be extended to grant this override automatically to someone holding a certain identifier or privilege rather than permitting everyone in the world to bypass accessibility controls, but, since our shop doesn't use any sort of complicated tape control, it wasn't necessary to do anything complication to get the job done (hence the quick-and-dirty approach). Note that this program was built by using SYS$EXAMPLES:DOD_ERAPAT as a template and replacing the SYS$ERAPAT code with code analyzed from the original running $MTACCESS service. Feel free to extend this simple hack any way you like. Enjoy! Andrew Pavlin General Electric Co. Ocean & Radar Systems Department Syracuse, NY 13221 phone: (310 456-1875 email: pavlin@syr.ge.com