Thumb Print scanner to Log On?

Is it possible to log onto your Windows Xp (SP2) username near a thumb print scanner instead of the normal password? How would i step about doing this?I thought that would be pretty cool so i simply wanted to know if it would work!! And if so does anybody know of any appropriate websites or stores i can get one from?
Im using a Dell Dimension 9150 desktop workstation.

Answer:
Microsoft sells a mouse and thumprint reader, roughly speaking $50 retail at CompUSA. It comes with software to allow logon using thumbprint alone.
this would be great and stop my juvenile daughter logging on to c**p sites and loads of stuff being downloaded on to my notebook lol

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