[Cableguy]

The sample you gave, the matching/ discovering diferences in images...
Can be acomplished in the device, although I agree its a very tricky, and code taking job... but its doable with the mouse event's...
Then you would have to compare the clicked coordinates with the "stored" or "listed in a file" ones...

An hotspot, as you call it, would endeed be a plus, but is something that, as I sayed, can be workrd around, for your "image game"....