To invoke the Internal Trace Facility the following procedures are required:

1. IBM provides a trace control module which must be included in a load library (on z/OS and CMS), in the standard load module search order, or in a library in the standard phase search order (on z/VSE), that is available when the assembly is run. Your IBM support representative will provide you with the necessary instructions to perform this procedure.
2. Run the assembly with the ITF assembler option. The ITF option syntax is described below under ITF assembler option.
3. Your IBM support representative will advise you of the best method for providing this material, and of sending it to IBM.