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For contacting the concert manager from a client host, the concert client is required. This is a small Java startup program that can be published via the WWW and that implements the client side of the manager protocol sketched in the previous subsection. Its essential task is to display the score information provided by some concert manager, transmit the credentials (password) to the server, receive the corresponding score and start its execution by invoking an JVM interpreter as an external process. The task of the concert client is then fulfilled and it may terminate.