how do i know which key is pressed?

hi guys
i wanted to now that how can i understand which keyboard key is pressed. i don't mean the keypress event. maybe my app doasn't have the fouces but i wan to know which key is pressed

That can only be done by hooking the keyboard, which is a rather tricky thing to do.

my english is poor. what do u mean by hooking the keyboard?

Hooking is a computer term, which means that you redirect low-level messages sendt form the hardware away from the default system processing function, and into a function that you define. You can then process the information before the rest of the system (almost, that is)

aha so i guess that's not my job. ok i'm thinking for another trick
thanks