If you ever wondered at how MSDOS 6.0 was created, turns out the source code for it is open source now. Someone found it using Googles new Code Search page.
http://www.google.com/codesearch?q=show:WtWZkLcWeso:LqnnKA42GyA&sa=N&ct=rdp&cs_p=center.cie.hallym.ac.kr/%7Eyuko/cgi-bin/ez2000/system/db/linux/upload/45/1070214716/MS-DOS.6.0.Source.Code.zip
hey guys just add some funky looking front end/gui and you've got vista LOL