INT 21 - Novell NetWare - WORKSTATION - SET PREFERRED CONNECTION ID             
	AX = F000h
	DL = connection ID of prefered file server (1-8) or 00h for none
Notes:	this function is supported by Advanced NetWare 1.0+
	the preferred connection ID is set to 00h by the shell on EOJ
SeeAlso: AH=D6h,AX=EF03h,AX=F001h,AX=F002h,AX=F005h