About this chapter

The organization of a VTAM® application program affects how much storage it uses, how well it performs, how easy it is to write, and how easy it is to migrate to a later release of VTAM, if required.

z/OS Communications Server: SNA Programming contains VTAM programming considerations for organizing an application program. Refer to that book for the following issues that affect LU 6.2:

Processing synchronously versus asynchronously
Using ECBs versus RPL exit routines
Interfacing with the operating system
Managing control block storage
Easing migration to later VTAM releases

This chapter covers the following additional considerations that are unique to LU 6.2:

Request of LU 6.2 services
Startup processing for LU 6.2 application programs
LU 6.2 transaction processing
Implementing LU 6.2 option sets

Note: The first three items in the list of unique LU 6.2 considerations must be addressed. The application program may also implement optional LU 6.2 functions. These depend on the specific application in which the LU 6.2 architecture is being used.