Support for using TSO/E services in non-TSO/E environment

TSO/E environment service allows applications to use a subset of TSO/E services and unauthorized commands without starting a TSO/E session. This supports applications that are not running under the terminal monitor program (TMP) IKJEFT01. It also includes writing transaction programs that can access TSO/E services from outside of the TMP.

A program can use the TSO/E environment service to build and initialize a TSO/E environment instead of using the TSO/E terminal monitor program (TMP). The environment consists of a set of initialized TSO/E control blocks, an initialized I/O stack, and settings to indicate background processing. A REXX language processor environment will also be initialized if a previous REXX environment does not exist.

There are some limitations to the TSO/E environment service because of the internal task structure necessary for some functions in TSO/E. These internal task structures cannot be created without the TMP. Commands and operations that are not supported include:

Authorized commands
FIB (Foreground Initiated Background) commands
TEST command
CONSOLE command
Attention processing
Session Manager operations (except SMCOPY)
ALLOCATE command (using the ALTFILE keyword)

For complete information about how to use the TSO/E environment service, see z/OS TSO/E Programming Services.