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#### Messages from and to external objects

There are two methods to deal with the fields that `hsolve` computes. The first one is via regular Genesis messages. These messages must be created on the modeling elements before the `SETUP` call. During byte-code compilation, `hsolve` will examine all encountered elements for incoming and outgoing messages and remember to handle these messages during simulation time. If `hsolve` cannot handle such a message, it will give a warning message in the terminal.