Can you in practice ever overclock a laptop?

I was wondering what these lines in Everest Home edition mean:
Processor Properties: Manufacturer Intel External Clock 100 MHz Maximum
Clock 1000 MHz Current Clock 850 MHz

CPU Type Mobile Intel Pentium IIIE CPU Alias Coppermine, CuMine, A80526

CPU Speed: CPU Clock 851.88 MHz (original: 850 MHz)

Can you, - in practice, - ever overclock a laptop? There is a 1GHz version
of this Latitude (with the exact same model number): Is this something other
than the same chip overclocked by Dell? I thought that (being a bit
simplistic about it) every time you ever overclocked a computer, you had to
put an additional fan in? I am now starting to think about overclocking my
1.3 GHz Dimension 8100 (which speed was about as slow as the P4 was ever
made and) in which the chip is surrounded by a huge shroud and gigantic fan
whick looks as if you couldn't add to it by putting another or an even
bigger fan in?

In practice, No. Impossible, No, but very difficult and probably not
worth it in your situation. The ONLY plausible option would be to
find a faster processor (1000 MHZ?) and replace the one in the
laptop, if that is even doable. Your processor has a "locked"
mulitplier, plus it is VERY, VERY doubtful that your laptop's
motherboard supports other buss speeds in increments that your
current processor would tolerate.

Everest is probably just reporting the upper range (1000 MHZ) of that
processor version from it's database. For example, if testing an AMD
Athlon Thunderbird series chip, it could report current speed as 1200
with a max of 1400 (the highest of the line).

The "adding a fan when you overclock" is simplistic, as you stated.
When you overclock (by raising the front side buss speed and/or
increasing the multiplier for the CPU) the processor will generate
more heat. If the current heatsink/fan combo is sufficient for the
increased heat load to dissipate it effeciently, then you don't need
to upscale the cooling already present. "Extreme" overclocking would
require more drastic means, the most efficient heatsinks, high speed
fans (Noisy) and major case ventilation....We are not speaking of
laptops anymore now.

If your laptop is running slow, other options (and I'm just going to
toss them out here) are:

- ADD MEMORY

- Clean the system of spyware/adware

- Watch out for all those "extra" programs that install with some
apps. They can really slow down your bootup, and eat up memory.

- Anti-virus/software firewall programs. Necessary but make sure they
are not "battling one another." My sister had a problem like this.
Norton A/V with McAffe firewall products. Man, those two programs
didn't like to get along with her system. When reinstalling, we went
all McAffe and it booted much quicker. Personally, I use AVG
antivirus (free) and ZoneAlarm firewall (also free) and have been
happy with it. (I believe) AVG is a smaller "footprint" than some of
the mainstream AV's. As for ZoneAlarm, I just plain like it, mainly
its ease of control compared to the windows firewall. Plus the price
is right.

- Or even a complete reinstall of the operating system. Sometimes the
OS just gets a bit cluttered with old fragments of stuff and a clean
install is the fastest way to bringing your laptop back to life.