INT 21 - DOS 3.1+ network - SET REDIRECTION MODE
AX = 5F01h
BL = redirection type
03h printer
04h disk drive
BH = redirection state
00h off
01h on
Return: CF set on error
AX = error code (see AH=59h)
CF clear if successful
Notes:  when redirection is off, the local device (if any) rather than the
remote device is used
calls INT 2F/AX=111Eh with AX on top of the stack
SeeAlso: INT 2F/AX=111Eh

See also: 215F00

215F01 - DOS 3.1+ network - SET REDIRECTION MODE