Today I wanted to write about the CRUT transaction - a new function, that comes with the z/VSE Language Environment (LE) in z/VSE 5.2. Then I remembered the LE blog of my colleague Garry Hasler. He posted more information on CRUT already. CRUT can be used to activate, query and deactivate the run-unit work-area (RUWA) tracing function. The LE blog entry is here . May be you are already following Garry's blog. Just in case you don't, here is the link .