System Level Procedures › Intercept Solicited and Unsolicited VTAM Messages (PPOPROC Procedures) › PPOPROC Prerequisites

PPOPROC Prerequisites

The following prerequisites apply:

• Before your product can receive messages from VTAM, a PPO START command must be successfully executed to authorize the system for the receipt of unsolicited VTAM messages. The PPO START opens the VTAM ACB specified on the SYSPARMS PPOACBNM= to gain access to VTAM messages. The STATUS command can be used to determine whether the system has successfully executed a PPO START command.
• To start your PPOPROC, specify SYSPARMS PPOPROC=procname.
• If you want to receive copies of VTAM commands in your PPOPROC, you must have SYSPARMS PPOSOCMD=PPOPROC specified and verify that PPOLOG=YES is specified in your VTAM startup.
• To receive specific messages, issue DEFMSG DELIVER=PPO commands either in your PPOPROC, or before starting it.
• PPO message delivery to PPOPROC begins after the first &PPOREAD has been issued.

Note: For more information about the SYSPARMS command, see the Reference Guide. For more information about the PPO, STATUS, and DEFMSG commands, see the online help.