Finding Addresses

Well I dont know if this goes into C++ but im gonna try, tell me if im wrong.

First, does addies mean address?
Well, if it does how do I find addies in any game or program?

Well for the simple games like Minesweeper I can do it, and I can also find addresses for Notepad and detour the functions but how can I do it for more complex games or programs, like Crossfire, Combat Arms, and stuff like that?

I use IDA Pro, I have Ollydbg but I dont use it.