I currently have three monitors hooked up to my computer. I was just wondering if it is possible to have two monitors use the window manager - so, GUI - and have a single monitor not using the GUI but only command-line?
Open the terminal and move it on which monitor do you wish. Press F11 to put terminal in full-screen mode, and voilà: you have only the terminal on that monitor.
Otherwise, I think that you can do it using virtualization. But only for this purpose it seems without sense.