Explanation of the EDIT command. It is EXTERNAL.

This command will start the MS-DOS Editor, which lets you
change or create ASCII files.

Switches:  /b    Displays the MS-DOS in Black and White.
           /g    uses the fastest screen updating for CGA systems.
           /h    Displays maximum number of lines possible for your
                 computer
           /nohi Enables use of 8 colors instead of 16.