accessing other programs data space.

Hi
I'm new to windows programming (i'm BREW and j2me+j2se programmer...)
I want to create an all-trainer for windows games.
It'll e for XP, vista is of no interest for me right now.

I was wondering if there is a system call or a hack to get a pointer to other processes that are running. Yes i'm aware of the security issue here, but trainers need to check up on variables that are not in the trainer space but in the game's and keep them on certain levels.

Can anyone enlight me here ?

Eyal.

Yeah. Don't start posts that are against forum rules.