INT 2F CU - NETWORK REDIRECTOR - REMOTE PRINTER ECHO ON/OFF                     
	AX = 1126h
	ES:DI -> SFTsee System File Table 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 SFTsee System File Table set
SeeAlso: AX=1124h