I was watching one of these catalogue mail order programmes last night and they were demonstrating a fan powered lap top cooler/rest. This is for use if you've got the laptop, say, on a wooden desk where the heat can't escape. The idea is that it props the lap top up while circulating cool air underneath it, thus preventing the unit from overheating.

According to the demonstrator, overheating causes the processor to under perform and can also shorten the life of the laptop.

Since my laptop spends most of its working life flat on a wooden desk, I'm interested in finding out:-

A.