No. There is no possible upgrade for a computer with a 120 MHz Pentium to an 800 MHz processor. You couldn't even replace the motherboard, as the case would not support newer motherboards (AT/Baby AT vs. ATX/microATX)
To laugh at him
Intel.
Yes
Pentium Duo Quad, Pentium core duo, Pentium D, Xeon, Itanium, Pentium M, Pentium 4, Celeron, Pentium 3, Pentium 2, Pentium Pro, 486, 386, 286.
Pentium 4 with HT technology runs at the highest speed.
Yes, but it must be with one of the same type. EG, you can swap an Intel Pentium 3 1.5GHz with a Intel Pentium 3 2GHz, but not with an Intel Pentium 4 2GHz. Also, it must be the same socket type.
Before the Pentium CPU was introduced, the most common cooling mechanism inside a computer was a simple fan that was typically attached to the power supply.
Pentium 4
About 1 Gram
The Pentium 4 got it's name because it was the next series of Intel's flagship CPU line after the Pentium III.
It's limited by your motherboard on what CPU it can take. The list of supported processors is most likely listed in the manual.
Pentium D was the first dual-core cpu.