Connect to card.
        @param protocol: a bit mask of the protocols to use, from
        L{CardConnection.T0_protocol}, L{CardConnection.T1_protocol},
        L{CardConnection.RAW_protocol}, L{CardConnection.T15_protocol}

        @param mode: SCARD_SHARE_SHARED (default), SCARD_SHARE_EXCLUSIVE or
        SCARD_SHARE_DIRECT

        @param disposition: SCARD_LEAVE_CARD (default), SCARD_RESET_CARD,
        SCARD_UNPOWER_CARD or SCARD_EJECT_CARD

def connect(self, protocol=None, mode=None, disposition=None):
        """Connect to card.
        @param protocol: a bit mask of the protocols to use, from
        L{CardConnection.T0_protocol}, L{CardConnection.T1_protocol},
        L{CardConnection.RAW_protocol}, L{CardConnection.T15_protocol}

        @param mode: SCARD_SHARE_SHARED (default), SCARD_SHARE_EXCLUSIVE or
        SCARD_SHARE_DIRECT

        @param disposition: SCARD_LEAVE_CARD (default), SCARD_RESET_CARD,
        SCARD_UNPOWER_CARD or SCARD_EJECT_CARD
        """
        Observable.setChanged(self)
        Observable.notifyObservers(self, CardConnectionEvent('connect'))