nGlide is a 3Dfx Voodoo Glide wrapper. It allows you to play games designed for 3Dfx Glide API without the need for having 3Dfx Voodoo graphics card.
With PCem you can emulate any old computer, configuring them with DOS or the various versions of Windows.
Don't you know what it is an emulator? It's simple: an emulator is a program that let you run games and programs of your old computers into the modern PCs, Macs, mobile phones and new generation consoles. You could load the images of those games, whose are available for thousands in Internet.
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