Jan Rouvillain is studying xf86sup.sys driver and ask programming questions about xf86sup.sys driver. I have posted a copy of Holger Veit's e-mail at cygwin-xfree URL, or you can access it directly: http://sourceware.cygnus.com/cygwin/xfree/xf86sup.html You may find Holger e-mail very informative. Suhaib