This program sets attribute "override_redirect" to True for any window you've specified (using window name). Window Managers should ignore such windows; it's useful, for example, if you're using wmx Window Manager, and want to have a clock on every virtual screen and without any borders. Just add the following string to your X-startfile (after starting watch app): xnodecor -w watch (assuming that your watch application has a window named "watch")