bind.socket             Create an endpoint for accepting connections
                        and bind it to the socket referenced by the
                        socket argument.
connect.socket          Connect the socket referenced by the socket
                        argument to the endpoint specified by the
                        endpoint argument.
init.context            initailize zmq context and zmq socket
init.message            create a message object.
poll.socket             Polls a list of sockets, waiting for the
                        presence of a nonblocking read, write, or error
                        event.
receive.multipart       Receive multipart ZMQ message
receive.socket          Receive a message from the socket referenced by
                        the socket argument.
send.multipart          Send multipart ZMQ message.
send.socket             send a message.
set.hwm                 set a socket option.
zmq.errno               get libzmq error numbers and error strings
zmq.version             get version of libzmq
