I saw a program that could take a screen shot and take any text off your screen for $19.95. (Before you laugh and say it's stupid to pay twenty bucks for something you could do in a single keystroke, we're talking any text off the screen, including that stuff you can't get a cursor at, like pdf's and aol member directories, for example.)

Would creating a program like this be as totally massive of an undertaking as it would be to create a scanner ocr program, or does anyone think it could be done with less effort?