KEY MAPPING HEADACHE

In my game the player presses hot-keys to use items.
I do this with conditional branches.
I know that "A" in a conditional branch does not actually mean "A" on the keyboard.
I know that "A" has been key-mapped to another key.
I would like to know how to change the key mapping.
Obviously, the player will have to know how to key-map as well, so I would like to be able to give them a good explanation.

If credit is wanted, I have no problem giving it.

author=ShortStar
If you start your game and push F1 go to the keyboard input or whatever its called and you can see what key means what.

Thanks.