'Send C{inObject}, an integer file descriptor, over C{proto}\'s connection
and return a unique identifier which will allow the receiver to
associate the file descriptor with this argument.
@param inObject: A file descriptor to duplicate over an AMP connection
as the value for this argument.
@type inObject: C{int}
@param proto: The protocol which will be used to send this descriptor.
This protocol must be connected via a transport providing
L{IUNIXTransport<twisted.internet.interfaces.IUNIXTransport>}.
@return: A byte string which can be used by the receiver to reconstruct
the file descriptor.
@type: C{str}'

def toStringProto(self, inObject, proto):

    identifier = proto._sendFileDescriptor(inObject)
    outString = Integer.toStringProto(self, identifier, proto)
    return outString
