How do OS upgrades work on each type of machine...

Hi all.
Forgive my ignorance, but if i do a clean install of leopard, how does it know what machine I am using. From what i see, the install disks that come with my laptops/imacs/mac pro all have a different 'disk 1' and the same 'disk 2' I assume on disk 1 is all the hardware specific things.. and disk 2 is generic.
Am i thinking too 'windows' and that the install is intelligent to know what the machine is, and then install the relevant applications/shortcuts/keyboards etc?
Is it better to do a clean install rather than an upgrade? Or am i thinking too 'windows' again?
Cheers!

You aren't thinking too windows. The kernel needs, and does, know what hardware it's dealing with. As the kernel initializes during bootup it can check with the PRAM/NVRAM (Programmable Random Access Memory, Non Volitile Random Access Memory) to get hardware info. It can also interogate any other hardware that it finds. It loads the appropriate kernel extensions to deal with the connected hardware.
If you want to see what the kernel's variables and their values are, launch terminal and run the following command:
sudo nvram -p
nvram -p will just print out the varaibles/values in nvram.
Roger

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