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USAGE
        talk <user> <message>

DESCRIPTION
        Sends a one-line message to another user of the node. The user
        in question must be in idle state (ie. not connected/connecting
        anywhere or running a program).

        If the user has an SSID other than zero, the SSID must be
        specified. If multiple users are logged in with the same
        callsign/SSID pair, those who are in idle state, get the message.

EXAMPLES
        talk oh7lzb-3 Good evening, Hessu!