TSOLIB command

The TSOLIB command provides for an additional search level that TSO/E uses when searching for commands and programs. With TSOLIB, you specify load module and program object libraries containing executable commands and programs, which are put to the top of the standard search order.

You can activate and deactivate the additional search level without leaving your TSO/E session. For the life of the additional search level, the activated load module and program object libraries serve as a task library to commands and programs you invoke.

This provides for flexible access to different versions of commands and programs, reduces the access time, and can simplify management of user IDs and LOGON procedures.

The TSOLIB command, with its ACTIVATE operand, allows you to request access to load module and program object libraries. The requested load module and program object libraries will be put to the top of the system's search order for load module and program object libraries.
It allows you, with its DEACTIVATE operand, to remove these load module and program object libraries from the search chain, thus, reestablishing the previous search order.
The TSOLIB command allows for stacking multiple requests for load module and program object libraries, making any further request to become the active one but keeping the previous requests stacked for later use. Every removal, and respective deactivation, of the currently active request reactivates the previous request. This allows for faster variation of your library search order without having to enter lengthy command strings.
The stacking of multiple requests can be inhibited, thus ensuring that a request is performed only if no previous request is active.
The DISPLAY operand of the TSOLIB command shows the currently active libraries being put to the top of the standard search order. If any library requests are stacked, they are shown as well.
The RESET operand sets the search order back to its original state.