JCL: How to find out the LOADLIB of a utility program.

Lets say you are running a program, which is found in some system libraries and you wanted to find that LOADLIB. To know the PDS wherein which load module resides issue the following commands.

TSO ISRDDN

LOAD load-module-name

When you issue the LOAD command a ISPF screen will pop up and it will show you the name of the LOAD PDS where in the program is located.