If you're a techie and are ever really bored, here's something you can do for amusement...

Assume you're running on some flavour of Windows. First create a virtual machine running Linux. 

Now in your virtual machine, let's fire up a CP/M emulator. A machine running in a machine running in a machine.

Now wasn't that fun?

Now let's take it one step further...

In your virtual machine, run a windows emulator. Now run some cygwin tools.  Maybe ssh (from within a Bourne shell) out to a Mac and do something there.

So now you've got Mac stuff running under Linuxy stuff running under Windows running under Linux running under Windows.

Like I said, you need to be really bored to do stuff like this. And don't even think about trying to explain to anybody why it's even amusing.