If you happen to have any old DOS programs you'd like to run, but they won't run under Windows 7, you might look at DOSBox. It's free, and was designed for gamers to run their old games.
And if you happen to be running DataEase for DOS, with a final release date of 1993 or so, be sure to set core=normal. For some reason it makes a big difference.
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you're unlikely use.