Well, I just learned something....I went back to the auction and the laptop still was not there. There were only 3 items. With sudden inspiration, I hit 'reload' on the auction page, and all the new items were there.

Somehow, it was getting old data from my cache, I guess...but I had posted and reloaded Mudcat in general several times.
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A laptop and a notebook are essentially the same. There is a new sort of thing called a 'netbook', which is just designed for internet access and is smaller and has no CD drive.