There are no "ports" on a Pentium processor.
The Intel Pentium DualCore 1.43Ghz is the Merom T2310 with 533fsb, 1MB L2 Cache, 65nm, and the unnamed 2.5Ghz could only be the Intel Core2Duo Penryn T9300 with 800fsb, 6MB L2 Cache, 45nm. The Penryn is newer, faster and more efficient.
Nobody, since there is no Pentium 5 processor.
There is no "Pentium R" processor. Knowing this, the biggest difference is that the Pentium III exists and the other does not.
The first Pentium processors (Pentium 60 - 66). A Pentium OverDrive processor is also available for it.
A Pentium 4 processor, and a motherboard that supports it.
pentium mmx
Probably the Pentium Dual-Core, as it is the most recent processor to bear the Pentium name.
I'd say yes but It may be slower and may crash at times. The pentium 4 processor is faster than the Pentium 3 processor so using the pentium 3 processor made for something that is faster than it's self will have it's drawbacks and may have complications.
Nothing, a Pentium Processor, or any other processor for that matter, is merely a brand name for different microprocessors.
It is how good your processor is compared to the Intel Pentium.
Officially, Windows XP requires a minimum of a 233 MHZ Pentium processor. Unofficially, with a minor patch or via hard drive swapping, any Pentium processor can be used.