The Drop Copy (for the virtual server) is, the virtual server which only uses to receive notice, sending and receiving operation telegram withinside arrowhead. The original copy is possible to make setting with only order and notice virtual server. (The inquiry reference virtual server is not possible to make setting with the original copy) Even though it is possible to recieve notice and etc. with the order and notice virtual server, by using this function, it is possible to receive notice in the another virtual server.