Stupid question but....
I'm working on jitter's tutorials.
I don't find the tutorial that explain how to send the jit.window or jit.pwindow (result of the jitter's chain) to video projector (the main aim).
Generally when you plug a projector in you can either select mirroring from your video settings to show what you see on your screen on the projector, or you can set up another display that is an extension to your main screen. If you don't have mirroring on you can just drag your jit.window across to your second display and fullscreen it, if you do, just fullscreen it.
You can also use jit.window messages to set the size and coordinates of the window so you can manually tell it to fill your second screen.