Emulate legacy operating systems on Linux (IBM developerWorks)
One of the best things to do with a Linux box is to run programs for other operating systems on it. It can simplify your life considerably. Companies spend millions on "server consolidation" in hopes of reducing maintenance, administration, and even heat burdens. They're usually just moving between different flavors of UNIX, though. What they often don't realize, however, is that the range and quality of Linux-hosted OS emulations -- some of them rather old, like CP/M, RSX, OpenVMS, and DOS -- are quite high. Moreover, companies don't always understand just how much this software can enhance the convenience of server-room operations."