Look here http://developer.apple.com/darwin/ and http://www.opendarwin.org/
The base is pretty much a linux but as has been mentioned before, they have plenty of hardware-specific code and their cocoa which realistically only works on their gear, so don't expect to run mac software on anything other than a mac. Going the other direction, if you open up a terminal window on a mac (though thats something the mac users I know would *never* do on their own), you'll see the familiar bash prompt, and you can download a great deal of linux source code and compile it and run it even, without too much trouble. X11 applications can run on a mac, though from what I've seen its kinda cobbled together like the x emulators for windows, so the fonts and cursors and such won't act like the rest of your system (this was most noted in relation to the mac version of openoffice which hadn't had the code added to make it talk natively to the cocoa interface though they may have finished that part by now). -- Scott Taylor - <[EMAIL PROTECTED]> I got the bill for my surgery. Now I know what those doctors were wearing masks for. -- James Boren -- gentoo-user@gentoo.org mailing list