Pentium 4-m laptop?

Can someone please tell me the difference between pentium 4, pentium m and pentium 4-m laptops. A friend is selling a dell inspirion 6250 laptop. It has a pentium 4-m 1.8 processor in it. Is this better than the standard pentium 4 and pentium m or worse?

  sicknote 22:37 22 Jun 2004

just what i was looking for...cheers

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