Draw onto screen over a fullscreen Direct3d game

The topic pretty much explains it all. I would like to know how i could draw a dot onto the centre of the screen while a fullscreen Direct3d game is running (the game is Unreal Tournament 2003 although i don't think that matters too much).

I have seen it done before (specifically a 'trainer' for the game Mafia drew a little menu on the screen while mafia was running). I am pretty sure the trainer wouldnt have been coded with VB so it may not be possible to do it with VB, but i can't help but wonder :)

If anyone can help me in any way i would be most thankful :)

I suppose you too will have to learn to use DirectX from VB.

Well, seeing as DirectX is essentially drawing directly through a Device Context and onto the screen, if you made an app that started after unreal and then used DirectX, you would probably get the desired results.

Do you know for sure whether Mafia was done in DirectX? If it was done in OGL then it would be very easy to simple draw on top using DirectX or another OGL app (not that it really matters ;))

Well yes Mafia was using Direct3d (which i guess must be DirectX, havent dabbed to much into DirectX), thanks for the help so far, i'll have a play about and see what i can come up with :)