An explanation of mobile needed please

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Mobile Intel® Pentium® 4 Processor (552 with HT)

Intel® Pentium® M Processor (Centrino)

Intel® Celeron® M Processor (Celeron mobile)

Could anyone (someone whose brain works) try to give me a simple explanation of the differences between these 3 cpu types? I know they have different features but what I'm confused about is the mobile feature of these 3.

 

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I take it by the amount of response that no-one else knows either.

 

Thanks AJ, it does help more than a bit.