/**
     * @return whether signing has been negotiated
     */
    boolean isSigningNegotiated ();


    /**
     * @param cap
     * @return whether capability is negotiated
     */
    boolean haveCapabilitiy ( int cap );


    /**
     * @return the send buffer size
     */
    int getSendBufferSize ();


    /**
     * @return the receive buffer size
     */
    int getReceiveBufferSize ();