I gave a more thorough answer to your first question in
the thread you started in HELP!?!?! Essentially, as far as I know, it could be faked by making two custom windows that were just black windows that you could position over the sides, but there was a command from EQ1 that actually performed this function better, known as the /viewport command. Check out your other thread (linked earlier) if you want an explanation of what it does.