Brk

Brk :With this method you can pass through .Hope this will help you.
This works in win xp onlydo this trick wait for user login screen to appr while turning on the computer



Now just type the following ---->Alt+Ctrl Button and two times delete button


This type of dialogue box will open on pressing the above comination
type the username as administrator and lve the field blank and hit enter
After you do this, the computer will open and you can access your friends pc