I have a friend who is doing something quite mad - trying to run a program designed for Windows on a Mac. Predictably, the endeavour has run afoul, with several problems I simply cannot troubleshoot from a PC. So, I need a test-bed to experiment with the program under his conditions, and the best solution would be to run a VM emulation of OSX.
But, I don't know anything about Macs except how to use them. Is OSX a stand-alone operating system, like the various Windows incarnations, or can it only be obtained when purchasing a Mac? Is OSX Lion (which is what I get when I Google "buy OSX") actually what I see on a Mac, or is it some kind of iPhone App?