VTAM Exits

VTAM Customization describes the exits listed in Table 1.

Table 1. VTAM Exits
Exit	Description
ISTAUCAG	Calculates and records time during which a terminal user or an application program is logged onto an application program
ISTAUCAT	Validates a logon request to an application program
ISTEXCVR	Provides ACF/VTAM with an ordered list of virtual routes for path selection to transmit data through network
ISTINCDT	User supplies supplementary tables to session-link unformatted system services table which ACF/VTAM uses to handle command input and message output
ISTINCLM	User can change IBM-supplied logon mode table which contains parameters representing protocols for telecommunications session or user can supply supplementary tables
ISTINCNO	User supplies supplementary tables to operation-level unformatted system services tables which handle commands from an ACF/VTAM operator and messages to an ACF/VTAM operator
ISTMGC00	Communication network management (CNM) table routes unsolicited network service requests to application programs to record and report maintenance statistics
ISTPUCWC	Virtual route pacing window size calculator specifies limits to data flow through a network to avoid congestion in nodes along a virtual route
ISTRACON	Module containing constants used to control functions not suitable for modification by operator command or start option