INT 21 - Novell NetWare - PRINT SERVICES - GET BANNER USER NAME
        AX = B809h
        ES:BX -> 12-byte buffer containing user name
Return: AL = status
            00h successful
Desc:   specify the user name which is printed on the banner page
Notes:  this function is supported by Advanced NetWare 2.1+
        the default name is the login name of the user