Please ignore that question because i found an answer in pd list.

http://lists.puredata.info/pipermail/pd-list/2005-10/032209.html

---------- Forwarded message ---------- From: Gintaras Lau. gintarman@gmail.com Date: 2010/2/9 Subject: Usb light flash pd To: iem pd-list@iem.at

How in theory or practice possible to control laptop USB light with pd, to dim, flash?

Thank you