How to watch demos

Demos are made for almost any platform. One of the goals is to conquer all the new (and old) platforms and make them run things that'll pop your eyes out.

You can run both new and old demos on your PC or even on your cell phone or PDA. To run demos originally made for computers like the Commodore 64 or Amiga, you'll need an emulator program on your PC (or Mac or Linux), that turns your uber fast PC into a hearty 8bit machine.

HOW TO RUN COMMODORE 64 DEMOS ON YOUR PC
Read the instructions here and/or here.
And download the emulator.

HOW TO RUN AMIGA DEMOS ON YOUR PC
Read the instructions here.
And download the emulator.

HOW TO RUN OLD PC (DOS) DEMOS ON YOUR PC
Check this great guide by Crest.

HOW TO RUN DEMOS ON YOUR HANDHELD DEVICE
Read the info and download.