Microsoft DOS fasthelp command
Command that provides instant access to all of the MS-DOS commands, giving you a brief on each command; may not work in some versions of MS-DOS.
The fasthelp command is an external command that is available in the below Microsoft operating systems as fasthelp.exe.
Note: Fasthelp was a command only available through MS-DOS. After the release of Microsoft Windows 95, fasthelp has no longer been available.
Provides help information for MS-DOS commands.
command - displays help information on that command.
Display the help on most DOS commands, giving you a brief on each.