Hi,

I'm writing an experiment for kids where they will use a mouse to click on different areas of the screen to forward the program. I understand how to do this (I think), and need to define the areas to use as key codes. Is there some sort of grid I can use to help with determining the pixels for each rectangle? This is probably a stupid question, but I can see wasting a lot of time doing it by trial and error.

Thanks!
Becky