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### 23.5 Giving information about a plugin

A plugin should give some information to the user about itself. This uses the following structure:

    struct plugin_info
    {
      const char *version;
      const char *help;
    };

Such a structure is passed as the `user_data` by the plugin’s init routine using `register_callback` with the `PLUGIN_INFO` pseudo-event and a null callback.