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: AX=EF03h,AX=F001h,AX=F002h,AX=F005h