ALTLIB command — identify libraries of CLISTs and REXX EXECs

Use the ALTLIB command to identify libraries of CLISTs or REXX EXECs. The function, operands, and syntax of the ALTLIB command are the same as those documented in z/OS TSO/E Command Reference. However, the following special considerations apply for using ALTLIB in an IPCS session.

Using ALTLIB in the IPCS Dialog
When you activate the IPCS dialog for an ISPF logical screen, the system creates an ALTLIB environment for IPCS that will be used whenever you ask IPCS to process a CLIST or REXX EXEC. This ALTLIB environment is separate from the following ALTLIB environments:
- The ALTLIB environment maintained by ISPF
- The ALTLIB environment maintained by another IPCS dialog logical screen
- The ALTLIB environment used in IPCS line mode
To display or update the ALTLIB environment for the IPCS dialog logical screen, use the following command with appropriate operands:
```
IPCS ALTLIB
```
You can also enter ALTLIB without the IPCS prefix from option 4 of the IPCS dialog. You cannot use the QUIET option of the ALTLIB command. The QUIET option requires ISPF services, which are not made available to TSO/E commands by IPCS.

Changes that you make to the ALTLIB environment for that logical screen will remain in effect until the next ALTLIB command is entered or until you exit the IPCS dialog.
Note: The following command is a request to display or update the separate ALTLIB environment maintained by ISPF, not the ALTLIB environment maintained by the IPCS dialog:
```
TSO ALTLIB
```
Using ALTLIB in IPCS line mode or batch mode
When you use IPCS in line mode or batch mode, IPCS continues to use the same ALTLIB environment in effect when it received control. ALTLIB commands entered before the use of IPCS remain in effect. ALTLIB commands entered during the IPCS session will display or update this environment. This ALTLIB environment is not affected by ending IPCS.