The TSOLIB command with its ACTIVATE, DEACTIVATE, and RESET operands is intended to be issued from TSO/E READY mode, either in the foreground or in the background. The requested extension on the search order becomes effective when TSO/E READY mode processes its next command. If the TSOLIB command is issued from any other environment, like ISPF or REXX, only the TSOLIB command with its DISPLAY operand is valid.

The TSOLIB command must be issued from a "TSO/E READY" environment. This condition is met when TSOLIB is invoked from the READY prompt or from a CLIST invoked from the READY prompt. To invoke the TSOLIB command from a REXX exec, however, the command must be placed on the REXX external data stack. Execution is delayed until after the REXX exec completes. Just before the READY prompt is redisplayed, all of the commands on the REXX external data stack will be read and executed. This will retrieve and execute the TSOLIB command that was placed on the REXX external data stack by the REXX exec. For more information, see TSOLIB command examples.