LU 6.2 control blocks and mappings

Two of the control blocks deal with session limits. The CNOS session limits control block is used as an interface for the APPCCMD CONTROL=OPRCNTL, QUALIFY=CNOS macroinstruction. The DEFINE/DISPLAY session limits control block is used as an interface to the LU-mode table for the APPCCMD CONTROL=OPRCNTL, QUALIFY=DEFINE and APPCCMD CONTROL=OPRCNTL, QUALIFY=DISPLAY macroinstructions.

A mapping of the function management header type 5 (FMH-5) is used in conversation allocation. It is used on the APPCCMD CONTROL=ALLOC, APPCCMD CONTROL=RCVFMH5, and the APPCCMD CONTROL=SENDFMH5 macroinstructions.

The TESTSTAT control block contains information passed to the application about the status of one or more active conversations.

The RESTORE control block contains information that describes the LUs, modes, and sessions that are being restored for a VTAM® application program that is recovering after a previous failure. For information on the:

Recovery process, see Restoring modes and any associated persistent LU-LU sessions.
RESTORE control block, see Retrieving information for a mode and sessions to be restored.
Retrieval of information from the RESTORE control block, see Example of retrieving information for a mode and any restored sessions.