Programming: Convert a Keystroke into a Mouse Button.

I have an old laptop. I'd like to be able to have middle-mouse button functionality, but the darned thing only has two buttons and no function to get a middle button click.

So, I thought I'd go find a program to convert one of the never-at least not by me-used windows keys to the middle mouse button. Seemed reasonable enough, but I couldn't find one that looked like it would work. Lots of stuff out there going the other way; keystroke by way of mouse button... yippee, but doesn't fix me.

So, I'm going to write a bit of code to see if I can learn how to do this. Should be fun. Will post again as I progress.

BTW, if anyone knows a good - free - program that can do just this ( on win xp ) let me know... especially if it's open source :)