IBM TSO/E REXX User Manual page 120

Issuing Other Types of Commands from an Exec
When a REXX exec runs on a host system, there is at least one default
environment available for executing commands.
The default host command environments available in TSO/E REXX are as follows:
In a non-TSO/E environment, TSO/E REXX provides the following host command
environments:
v MVS (the initial host command environment)
v LINK
v LINKMVS
v LINKPGM
v ATTACH
v ATTCHMVS
v ATTCHPGM
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TSO - the environment in which TSO/E commands and TSO/E REXX
commands execute in the TSO/E address space.
MVS - the environment in which TSO/E REXX commands execute in a
non-TSO/E address space.
LINK - an environment that links to modules on the same task level.
LINKMVS - an environment that links to modules on the same task level. This
environment allows you to pass multiple parameters to an invoked module, and
allows the invoked module to update the parameters. The parameters you pass
to the module include a length identifier.
LINKPGM - an environment that links to modules on the same task level. This
environment allows you to pass multiple parameters to an invoked module, and
allows the invoked module to update the parameters. The parameters you pass
to the module do not include a length identifier.
ATTACH - an environment that attaches modules on a different task level.
ATTCHMVS - an environment that attaches modules on a different task level.
This environment allows you to pass multiple parameters to an invoked module,
and allows the invoked module to update the parameters. The parameters you
pass to the module include a length identifier.
ATTCHPGM - an environment that attaches modules on a different task level.
This environment allows you to pass multiple parameters to an invoked module,
and allows the invoked module to update the parameters. The parameters you
pass to the module do not include a length identifier.
ISPEXEC - the environment in which ISPF commands execute.
ISREDIT - the environment in which ISPF/PDF EDIT commands execute.
CONSOLE - the environment in which MVS system and subsystem commands
execute. To use the CONSOLE environment, you must have TSO/E CONSOLE
command authority and an extended MCS console session must be active. You
use the TSO/E CONSOLE command to activate an extended MCS console
session. See z/OS TSO/E System Programming Command Reference, for more
information about using the CONSOLE command.
CPICOMM - the environment that allows you to invoke the SAA common
programming interface (CPI) Communications calls.
LU62 - the environment that allows you to invoke the APPC/MVS calls that are
based on the SNA LU 6.2 architecture. These calls are referred to as
APPC/MVS calls throughout the book.
APPCMVS - the environment that allows you to access MVS/APPC callable
services related to server facilities and for the testing of transaction programs.