gtps2m2g | ACF/SNA Data Communications Reference |
TPF applications are defined during generation of the TPF system. Issuing the ZROUT command starts the application. It is then available to non-SNA terminals. Applications are available to the SNA network only after ZNETW activation. Thus, applications must be started (ZROUT) before the non-SNA network can access them; started (ZROUT) and activated (ZNETW) before the SNA network can access them.
TPF provides support to establish cross-domain application to application sessions. This is necessary because TPF applications cannot request a session. Instead, the TPF operator issues a ZNETW command with the LOGON operand. If the cross-domain application is a primary LU, the TPF application will act as a secondary LU. During TPF system generation, users can define up to 255 secondary LUs to access an application. TPF attempts to establish a session for each secondary LU defined.
If a VTAM system supports receiving NOTIFY PIUs, and a VTAM LU requests a session with a TPF application that is not active, TPF will send a NOTIFY PIU to the requesting VTAM system when the TPF application is activated. The VTAM system may redrive the session request if the LU is still available.
Issuing a ZNETW INACT command deactivates a TPF application. This makes the application unavailable to the SNA network and terminates all sessions with the application's logical units. The application is still available to the non-SNA network. Deactivation types are the same as for other resources: orderly, immediate, and forced.