Customizing Sessions for APPC/MVS
When sessions are bound between an MVS LU and any partner LU, VTAM® determines session characteristics
from a combination of:
- VTAM session defaults
- Logon modes as specified in:
- APPL statements
- Allocate calls
When more than one parameter refers to the same characteristic, certain parameters override others, as illustrated in Figure 1. A logon mode specified in an Allocate call overrides the parameters specified in the APPL statement. Both the logon mode and the APPL statement override VTAM defaults.
Figure 1. Overriding Session Defaults
When the local LU and its partner have conflicting definitions, VTAM negotiates the differences and resolves them internally.
To customize sessions and override defaults, define additional logon mode entries in the VTAM logon mode table for use in Allocate calls.