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Most of the hardware devices attached to your computer have names which are
recognized by DOS.  These names cannot be used as the names of files.  Some
examples are:

CON
    the console (screen)

AUX
    the serial (auxiliary) port

COM1
    serial port 1

COM2
    serial port 2

PRN
    the printer on the parallel port

LPT1
    the printer on the first parallel port

LPT2
    the printer on the second parallel port

LPT3
    the printer on the third parallel port

NUL
    a non-existent device, which accepts (and discards) output

Disks (such as diskette drives and hard disks) are specified as single
letters, starting with the letter A.  A colon character (:) follows the
letter for the drive.  Either uppercase or lowercase letters can be used.
 Some examples are:

A:
    the first disk drive

a:
    the first disk drive

e:
    the fifth disk drive