http://www.terheyden.com/blog/?p=202

x2go is an awesome remote desktop solution for windows->linux. However, by default, Alt-Tab doesn’t work! Luckily it’s easy to fix. Go into your x2go client settings and set thusly:

I’ve replaced -multiwindow with -rootless, and added -keyhook. You can read about the x-server / xwin options here .