Int 2F Fn 1126  CU - Network Redirector - Remote Printer Echo On/off       [N]

   AX = 1126h
   ES:DI -> SFT for file handle 4???
   SS = DOS DS???
   ???

Return: CF set on error

Notes: this function is called by the DOS 3.1+ kernel
   called when print echoing (P, PrtSc) changes state and STDPRN has
     bit 11 of the device information word in the SFT set

See Also: AX=1124h