How would I go about doing that? A bunch of computers in my school have piano like keyboards and mac software called "garage band". I wanted to see if in my spare time, i could play some of my guitar music on the keyboard, but I don't know how to transfer the notes.
Yeah you just need to know the notes on the guitar neck and where they are on the keyboard. Chords are played differently on piano/keyboard but you can still use the structure you get on the guitar.
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Power Tabs have the music written above the tabs, so if you can read music notation you'll be able to play it. Keep in mind that the guitar sounds an octave lower than it is notated. I don't quite understand what you want to do, but if you are indeed going to play on a keyboard, keep in mind that some things that are easy to play on guitar can be a pain to play on the keyboard.
For example, I would like to play this on the piano:

Call of Ktulu - Metallica

It should be as simple as transferring to that chart above yes?
How would I keep the octaves in mind when I do this?