Can anyone tell me how do I write a small C++ program?

[ajajanicki]

I need a program that light's up a pre-defined pixel on the screen so that the user think the display is faulty :-) Gonna play a trick on my friend :-) I'll appreciate the ready script most, got the compiler and stuff. Thanks !!
I've seen a similar program b4. It was a cheat for Windows Mine Sweeper game. When I moved my mouse over a field where there was a bomb, one pixel in the left top corner of screen went on :-) (it got back to normal if I moved my mouse over a field with no bomb)

[nick j]

That is not really possible to do without some serious modification to your friend's OS. Programs are only in charge of the pixels within their window(s), and even then you generally don't have pixel-by-pixel control over those images. You could make something that goes fullscreen and does that, but it would be easily removed and pretty complicated.