... If I'm reading this right, you want to use keystrokes to "click" an area on the screen?
There are ways to do it, but alas, young grasshopper, this is one answer I do not have readily available.
I've seen it down, though, it wasn't easy
Basically, it requires a bit of coding know-how. I don't know the commands (nor do I know if they'd work in Win7), but they are out there, and require knowing the positioning of cursor almost down to the pixel.