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A VTAM® application program can also communicate with another VTAM application program. The two application programs can be in the same host processor or in different host processors.

LU 6.2 components are an addition to VTAM. They perform many, but not all, LU 6.2 functions. LU 6.2 components enable an LU representing one application to hold a conversation with an LU representing another application. The applications participating in the conversation can be in the same domain or in different domains. LU 6.2 initiates and terminates conversations between LUs using normally established sessions. Although there can be multiple conversations using one LU 6.2-initiated session, they cannot be concurrent.

LU 6.2 associates resources with application programs. The application programs must further associate the resources with the appropriate transaction programs.

LU 6.2 components of VTAM together with the application program form a type 6.2 LU. VTAM supports most of the functions defined in the LU 6.2 architecture, but not all of them. For further information on LU 6.2, refer to the z/OS Communications Server: SNA Programmer's LU 6.2 Guide.