Coding session limits

These session limit values can be set for a VTAM® application program by coding specific operands on the APPL definition statement. The VTAM application program can also establish these session limit values and override the specifications on the APPL definition statement by issuing an APPCCMD macroinstruction with the QUALIFY=DEFINE operand specified. Following are the unique session limit values that are used:

The overall maximum number of sessions between two partner LUs for a given mode name, which you specify on the DSESLIM operand of the APPL definition statement
The minimum number of sessions for a given mode name for which the application program is the contention winner, which you specify on the DMINWNL operand of the APPL definition statement
The minimum number of sessions for a given mode name for which the application program might be the contention loser (the partner LU is the contention winner), which you specify on the DMINWNR operand of the APPL definition statement

The sum of the DMINWNL and DMINWNR values must always be less than or equal to the maximum number of sessions specified on the DSESLIM operand. The AUTOSES operand on the APPL definition statement can be used to have VTAM automatically activate a specific number of contention-winner sessions for a given mode name for the application program. VTAM establishes these sessions when the first CNOS request is issued by the application program for a partner LU using a given mode name.