We keep passwords if we want to keep intruders away from our pc.Some of us also have fingerprint locking system in our laptops which make it quite difficult to open the pc.But even if your family member,or some dear friend wants to access it they will need your thumb.A better way is to make a key and give it to family members.Yes a computer key.In this post I am going to show you how to make your pen drive work as a key for opening your pc.A software called USB System Lock makes your pen drive act as a key for your pc.When you first install this software on your PC it detects your pen drive and creates a digital key on it.This key is used by the program to authenticate the user and log him in the pc.Without inserting your pen drive it will not allow you to log in the pc.USB System Lock is a freeware so you can enjoy its benefits without spending a penny