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[Eagle of Fire]

Here is a list of all the DOS commands you can do under DOS. I don't think you can do more than a handfull in DOSBox tough, and they are all listed in the helpfiles.

To switch to your hard drive, let's say it's c:\

You type:
mount c c:
c:

And you should end up in your HD root directory, which is c:\

To mount CD drive or such, look here.

For a complete guide on how to configure DOS for games, look here.