Int 7F Fn 3B  - Alloy Mw386 - Set Terminal Parameters                      [N]

   AH = 3Bh
   AL = baud rate (00h = 38400, 01h = 19200, etc)
   CL = parity (00h none, 01h even, 02h odd)
   CH = handshaking (00h none, 01h XON/XOFF, 02h DTR/DSR, 03h XPC)
   DL = user number (FFh = caller)
   DH = machine number for user

Return: CF set if invalid user number

Notes: only available to supervisors
   the new parameters will take effect immediately if the user's terminal
     has not been started, else AH=3Dh must be called to post the changes

See Also: AH=3Ah,AH=3Dh