Epson Apex 20020 - Manual (Page 77)

Specifying the Drive Designator
If you want to access a program or file on another drive without
first changing the default drive, type the drive designator along
with the filename. For example, if you are logged onto drive A
and want to use a file named PROGRAM on drive C, you
would type the following and then press
Enter:
C:PROGRAM
MS-DOS loads and executes the file named PROGRAM from
drive C, but stays logged onto drive A.
Types of MS-DOS Commands
Each MS-DOS command is either internal or external. Internal
commands are commands that are built into MS-DOS and can
be used at any time once MS-DOS is loaded into memory.
External commands are separate program files stored on your
hard disk and MS-DOS diskettes.
If you display a directory of the files on your MS-DOS
diskettes, you see the names of the external commands but not
the internal ones. The following lists show which external
commands are on which diskette.
Startup diskette
ANSI.SYS
COMMAND.COM
COUNTRY.SYS
DISPLAY.SYS
DRIVER.SYS
EGA.CPI
FASTOPEN.EXE
FDISK.COM
FORMAT.COM
KEYB.COM
KEYBOARD.SYS
MODE.COM
NLSFUNC.EXE
PRINTER.SYS
REPLACE.EXE
SELECT.COM
SYS.COM
VDISK.SYS
XCOPY.EXE
4201.CPI
Using MS-DOS With Your Computer 4-5