To do this, CTRL-ALT-F1 to an open terminal, log in, and run:
xinit ./program -- :1
where program is the program file you want to start in a new X session. Assuming your normal X session is on
:0 and appears when you CTRL-ALT-F7, your new one will spawn on CTRL-ALT-F8.
Questions, comments? Please feel free to leave them in the comments section below. Thank you.