The standard search order

Without having used the TSOLIB command, TSO/E searches for a command or program using the following sequence:
  1. The step library or job library

    The user's LOGON procedure is checked for any //STEPLIB DD-card that specifies a user's load module library or list of libraries. If the module is found here, it will be executed.

  2. The link pack area

    The search is continued in the libraries specified in SYS1.PARMLIB member LPALSTnn. If the module is found here, it will be executed.

  3. The link list concatenation

    The search is continued in the libraries specified in SYS1.PARMLIB member LNKLSTnn. The module should be found here.

Parent topic: Search order for load modules