Use this command to display or hide the window where the debugger's output is shown, and also pages from any of the online Reference books are displayed.

Note: When you highlight any REXX keyword or function name in the editor, and press the F1 key, then a relevant page from the Reference books (or some other HTML page you create) will automatically pop up in this window. You should install the freely available REXX book from the "REXX Users" internet web site.