Light-pen software?

[spec@vax2.concordia.ca (Mitchell Spector)]

    Yesterday I found what appears to be a light-pen interface for the
Apple II at a second-hand computer shop. The actual card was a thick
plastic box (no visable chips or other parts) that was colored black
and silver, with a chord running off it with a pen attached. Now before
I run back and purchase it, does anyone out there have the software to
use this piece of hardware?

    Also, I'm curious, what would I be able to do with it? Could I use
it to read bar-codes you find all over books, magazines, food packages,
and mail envelopes, etc? Or was this interface used as a pointing device
for drawing on the screen? Whatever applications it can be used for, it
would obviously be quite useless without software. I remember years ago, 
back in junior high school, the library would scan bar-codes off books 
using a light-pen connected to an Apple IIe. I always wanted my own 
since that time. :)

Mitchell Spector
spec@vax2.concordia.ca