Can it run without the windows manager? (no XWindows, directly from terminal)I don't understand what do you mean. Do you mean you can start GeeXLab from the command line (with options)?
Can the whole screen resolution show nothing but the visual programmed? i looked at the demos and they all had descriptions on screen
Yes absolutely. All descriptions you can see on demos are just for information. You can control their rendering by code. Actually, you have to code the display of information, because GeeXLab does not do it for you. GeeXLab renders exactly what you have coded. It does not render things that you didn't code. Some demos use frameworks (like the kx framework) to make demos coding easier. But you are not forced to use them. You can code with the low level GeeXLab API (lua and python) or create your own framework/lib. You are free!