There are a few limitations: the file selector and image saving don't work. You can save position files and then later render them on the other OS, or save screenshots.
Plan9 terminals also don't provide any way to catch the arrow
keys, so you can't use them. Use the mouse to navigate in the
menus. Also, getting the screen resolution is impossible, so use
-pixelwidth and -pixelheight instead of
-screenwidth and -screenheight.
By default XaoS changes the colormap. This will collide with
other colorful programs like Mortha. You can disable this behavior
using -nopalette switch, but this will slow down
XaoS.
Plan9 driver was written by Jan Hubicka, 1997.