Mac question...kind of.

I got the MacIntel version of MacOSX 10.4, this is the version that can run on intel based computers.

However, i need “a previous install of Darwin, already set up on the machine”.

I don’t know what the heck Darwin is, nor can i find much information about it. If one of you Mac users could just tell me what it is, or what it does, then i’d be well on my way to finding a copy of it.