The MODEENT macro

A VTAM® link between two systems is a session. For every session, a defined set of characteristics called a mode must exist in a VTAM table called a log mode table.

This is the table that you named in the MODETAB option of the APPL statement.

You can create your own log mode table or add mode names to the default mode table, ISTINCLM, which is shipped with VTAM. If you decide to add your modes to ISTINCLM, you can find that table in SYS1.SAMPLIB.

Spiffy uses the Db2 default modes at first, but also sets up a separate mode table for modes that are used by Db2 for distributed data processing. This table can then be populated with additional modes as they are needed.