So then it doesn't work? LOL. I havent tested in GameEx but tried reading the help files as usual. There doesn't seem to be a switch for fullscreen (not that I came across) but there is a solution. If you look in the Preferences.cfg file located in the UserData directory of your emulator install, there is an option to set to fullscreen which then works when running from command-line. The setting is: FullScreen=01 Now if you run from command-line, your command-line should be as follows: BeebEm.exe -Prefs "C:\Program Files\BeebEm\UserData\Preferences.cfg" "[ROMPATH]\[ROMFILE]" Note: The location of my Preferences.cfg file may differ from yours, so just use your location for that part. Now for exiting the emulator, since not at my machine can only give advice since I can't test in GameEx but it will/should work with this solution. If GameEx doesn't work by sending ESC, then it may be because it is used in the emulator. You could try to disable that key in the settings or IMO, I think it would be best to exit the correct way to exit the emulator. Create and advanced config and setup theses keys to exit: Alt+f x I have exited successfully with those keys. Alt+f brings up the file menu and x is the key to exit. It's the best solution I could come up with, but it works.