To enable remote debugging using a PL/I Application debug configuration, you need to have an X window implementation installed and running before you start to debug, so that the output of a remote application running on a UNIX machine can be viewed on your local machine. You do not need X window for other debug configuration types.
Windows: Micro Focus ViewNow X is provided as part of Enterprise Developer. See Installing X Windows on Windows in the Installation section. Find the ViewNow X documentation on the Micro Focus Customer Care dropdown menu.