This is one that happened while I was doing something else, and needed to
see what kind of ports the Amiga was working with. It simply generates a
formatted list of all message ports that are open on your computer. You may
be surprised at how many there are!

To force an output window to stay open until you can read all the names and
cancel it, there's a separate batch file that starts this up.

Set your button gadget to call REXX:PORTS.BOOT, and set it as a BATCH file.
Set the close window delay to -1 so it will stay open until you want it to
be closed. PORTS.BOOT will call PORTS.REXX, and put a nicely formatted
listing of the open ports in the console window. PORTS.REXX does not have to
be run from Directory Opus, hence it does not have a *.dopus filename
extension.

Both files, of course, belong in your REXX: directory.