Other Uses for Digital Signature Scanners?

Tomcow2000 asks: "I just picked up a stack of digital signature scanners for way-too-cheap. They're originally from Bradlees and they are evidently made by MobiNetix. They have something that looks like a VGA port on the back, but nothing else (not even power). Anybody know what these are and what I can do with them?" Digital Etch-a-Sketch anyone?