void silc_client_get_clients(SilcClient client,
                                 SilcClientConnection conn,
                                 const char *nickname,
                                 const char *server,
                                 SilcGetClientCallback completion,
                                 void *context);

    Finds client entry or entries by the `nickname' and `server'. The
    completion callback will be called when the client entries has been
    found.  After the server returns the client information it is cached
    and can be accesses locally at a later time.  The resolving is done
    with IDENTIFY command.  The `server' may be NULL.

    NOTE: This function is always asynchronous and resolves the client
    information from the server. Thus, if you already know the client
    information then use the silc_client_get_client_by_id function to
    get the client entry since this function may be very slow and should
    be used only to initially get the client entries.

    Since this routine resolves with IDENTIFY command only the relevant
    information (user's nickname and username) is resolved.  For example,
    user's real name, channel list and others are not resolved.  Caller
    can/must resolve those separately if they are needed (for example,
    with silc_client_get_client_by_id_resolve).