I need accessing by low level so much as possible. That i need is more than accessing rate/delay/leds, but maybe i can achieve it using the way you suggest. I don't want to learn to build device drivers for a simple task, only have 1 life ;P ... After some mins... It looks like changes only are applied when you reboot, otherwise it doesn't work and changes aren't applied immediatly. That's not that i need. :( I need change the status of leds and typematic rate/delay from code, in run time and still couldn't find a way to do in VC++/MFC ain WXP without using device drivers. I know it's possible because i saw some comercial software (MFC) that don't install any drivers and change these settings, but how? I dunno. :doh: :sigh: Anyway thx for your help. ;) modified on Wednesday, May 21, 2008 9:34 AM