in responce,yes i have a full copy of lin4win you have to have win98SE installed. I can't answer #2,and #3 is : A virtual Machine is a program that creates a folder on your hard drive that you install an OS in,that tells the OS that it is a computer even though it really isn't.It installs the OS in question without changing anything on the host PC.
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As for win4lin.. windows for linux would be something to do in virtualbox.