Session-level unformatted system services table

The session-level unformatted system services (USS) table contains:

Definitions for terminal user commands (such as LOGON) that can be received from a terminal
Messages that VTAM® sends to a terminal
A translation table that is used for character-coded input from the terminal.

The session-level USS table converts character-coded commands that follow the USS command syntax into field-formatted SNA requests. The default session-level USS table is named ISTINCDT.

You can create a supplementary session-level USS table using USS macroinstructions to redefine the VTAM terminal operator commands or messages that you want to change. To associate the new terminal operator commands or messages with a specific LU, either specify the name of the supplementary table on the USSTAB operand of the LU's definition statement or specify the LANGTAB operand on any of the three terminal operator commands: LOGON, LOGOFF, and IBMTEST.

For more information about implementing your own session-level USS table, see the z/OS Communications Server: SNA Resource Definition Reference.

The default session-level USS table can be found in the z/OS Communications Server: SNA Resource Definition Reference.