ClearLock 2

ClearLock is a transparent screen locker aimed to make the computer tech/system admin's live easier by providing a way to disable input to a computer while still allowing you to see what is going on.

ClearLock is not a security system. Its purpose is to keep meddling users from screwing with the computer when you are fixing it. It will not keep your computer/data safe from someone who is determined to get at it.