A mailpiece inserter system is provided including a User PC or computer, a mailpiece inserter and a client server which are network connected to share information and data concerning mail run data. The user computer is operative to receive operator input in connection with mail run data and produce mailpiece content material having assembly code information. The mailpiece inserter is operative to receive the mailpiece content material and assemble the mailpiece content material in combination with envelops to form a plurality of mailpieces. The client server is operative to receive the mail run data for storing and tracking information concerning the assembly of each mailpiece. The communication network may be disabled in an open loop control mode to facilitate rapid mailpiece processing and enabled in a closed loop control mode to facilitate tracking, reconciliation and security of mailpiece assembly. The mailpiece inserter includes an inserter control system operative to read and interpret assembly code information directly from the mailpiece content material in the open loop control mode. The client server includes a control system engine operative to receive the assembly code information from the user computer and bi-directionally communicate with the inserter control system of the mailpiece inserter. The bidirectional communication facilitates processing and assembly tracking of the mailpieces in the closed loop control mode.