In addition to the defined negotiation limits, you can define on the APPL definition statement other parameters that VTAM® uses during CNOS negotiation. The application program sets these values in the CNOS session limits control block. These values are exchanged between the two LUs during CNOS negotiation at the same time the session limits are negotiated. The CNOS control block is specified on the APPCCMD CONTROL=OPRCNTL, QUALIFY=CNOS macroinstruction.

The parameters of the APPL definition statement and their corresponding fields in the CNOS session limits control block are shown in Table 1. Refer to the z/OS Communications Server: SNA Resource Definition Reference for detailed information on coding these parameters. For the meaning and usage of these parameters, see Building a CNOS session limits control block.