Modifying TSO/VTAM time sharing

You can use the MODIFY command to control the number of users allowed to be logged on to TSO/VTAM and to terminate TSO user address spaces.

 
F [jobname,]identifier,{USERMAX=nnnnn}
                       {USER={SIC  } }
                       {     {FSTOP} }

The parameters are:

jobname

The name of the job. Many installations use TCAS as the name.

You can use asterisk notation to specify more than one job or started task on the MODIFY command. See Using asterisks in MODIFY commands for more information.

identifier

The identifier specified on the START command for TSO/VTAM time-sharing.

If an identifier was not specified on the START command, the system automatically assigns the job name as the identifier. (See Displaying started task status for information about determining the jobname and identifier of currently active started tasks.)

You can use asterisk notation to specify more than one job or started task on the MODIFY command. See Using asterisks in MODIFY commands for more information.

USERMAX=nnnnn

The maximum number (0 to 32,767) of users that can be logged on to TSO/VTAM time-sharing at one time. Note that specifying USERMAX=0 causes the terminal control address space (TCAS) to suppress all LOGONs.

USER=SIC

Causes the TCAS to cancel all TSO/VTAM terminal user address spaces normally. The terminal users receive any messages queued for them. The TCAS remains active.

USER=FSTOP

Forces the TCAS to cancel all TSO/VTAM terminal user address spaces immediately. The terminal users do not receive any messages queued for them. The TCAS remains active. Specify FSTOP only if a system problem causes SIC to be ineffective.

If you issue the MODIFY command with the USER=FSTOP parameter, the affected address space is deleted from the system and recovery is severely limited.