Exit routines related to session establishment and termination

Several exit routines notify a VTAM® application program of requests that affect sessions. This section describes the following four exit routines that are designed for common use and are included in an application program:

When a CINIT request is received, VTAM schedules the LOGON exit routine to request that the application program establish a session in which it acts as the PLU.
When session-control requests, including BIND and UNBIND requests, are received, VTAM schedules the SCIP exit routine.
When certain network-services requests are received from the SSCP, VTAM schedules the NSEXIT routine. These requests can indicate the state of a session or of a session-initiation or termination procedure.
When a CTERM (or similar) request is received, VTAM schedules the LOSTERM exit routine to request termination of a session in which the application program acts as the PLU.

The following sections describe the purpose of these exit routines and the information available to them. For further information about how some of these exit routines are used for session outage notification, see Session outage notification. For a summary of exit routines involved in session outage or disruptions, see Table 2. For a description of the interfaces to the exit routines and of other general considerations that apply to exit routines, as well as alternative exit routines, see Using exit routines.