At my school the other day, there was a PowerMac G4 just sitting there with nothing plugged in at all. So I went up to have a look at it and on top was a standard wired Apple keyboard. But plugged into the back of it was quite and thin and about a few centermetres long white stick. It look a bit like a thinner version of those normal flash sticks you get (you know what I mean). On the end of it, it had a hole which was probably for putting a loop throught or something. Finally, on the bottom, it said on a grey sticker: APPLE RETAIL. Does anyone know what this is because I'm curious. Thanks.