Kreisen 3 8 6 X / X E - Manual (Page 79)

These are called internal commands and can be used anytime
after the system has loaded MS-DOS into memory. They do
not require the MS-DOS main system diskette to function.
More complex DOS commands are actually separate programs
that provide powerful features for your computer. These are
called external commands, and perform such tasks as
formatting a diskette, comparing files on different disks,
backing up a hard disk, etc. These commands require one or
more of the MS-DOS diskettes.
Hard disk system user’s can run any DOS command without
diskettes because the programs are stored on the hard disk
drive.
Case Sensitivity
MS-DOS does not differentiate between upper and lower case
letters in commands and filenames. This manual will show
commands in upper case for clarity, but you may enter them
either way. For example, both of these commands will generate
a directory listing of a diskette:
and
Function Keys and MS-DOS
As mentioned earlier, MS-DOS uses several of your keyboard’s
function keys to provide you with shortcuts. When you press
Using MS-DOS With Your Computer 4-7