Software Input/Output Guide X11 Administration ... - paulmick.com

Communicating with the Meridian 1 Page 17 of 1050
With multiple overlays operating concurrently, there is the potential for a
database conflict if two or more overlays attempt to modify the same data
structure. Multi-User Login software prevents such conflicts. When a user
requests that an overlay be loaded, the software determines if it could pose a
potential conflict with an overlay that is already executing. If no conflict
exists, the requested overlay is loaded. If a conflict does exist, the system
issues the following message:
OVL429-OVERLAY CONFLICT
The user can try again later, or try to load a different overlay.
Multi-User Login also introduces several user commands. With these
commands, the user has the ability to:
— communicate with other users
— determine who is logged into the system
— halt and resume background and midnight routines
— initiate and terminate terminal monitoring
— change printer output assignment
Maintenance display codes
Time and date of fault
Note: For complete feature information on Multi-User Login, consult
the Management Applications NTP and Overlay Loader and Multi-User
Login section in this NTP.
Maintenance displays are located on the faceplate of certain Meridian SL-1
circuit cards. A maintenance display code is a one-, two-, or three-digit
alphanumeric code which can indicate the status of the system and identify
faulty equipment. For a detailed definition of these codes, see the section
titled “HEX” in the System Error Messages NTP.
The system identifies the time that faults are detected. When a diagnostic
message is output, a timestamp is output within 15 minutes. The format is:
TIMxxx hh:mm dd/mm/yy CPU x
X11 Administration