Hi, based on the example http://www.boost.org/doc/libs/1_42_0/doc/html/boost_asio/tutorial/tutdaytime..., i wanna to separate the part of the code that open de connection , and the part of the code that write a string over the socket, the problem is , that i have no clear how to share the information of the socket between the both fuctions. In this code below i suppose that listen fucion must to return the socket information, but what data type must the function listen() return??? thanks so much in advance void Agent::listen() { try { printf("SERVER A STARTED UDPsk \n"); boost::asio::io_service io_service; tcp::acceptor acceptor(io_service, tcp::endpoint(tcp::v4(), 7777)); //for (;;) { tcp::socket socket(io_service); acceptor.accept(socket); } } catch (std::exception& e) { std::cerr << e.what() << std::endl; } } void Agent::write() { try { std::string message = "mymsg"; boost::system::error_code ignored_error; boost::asio::write(socket, boost::asio::buffer(message), boost::asio::transfer_all(), ignored_error); sleep(1); socket.close(); return; } } catch (std::exception& e) { std::cerr << e.what() << std::endl; } } -- Ing Pedro Alonso Chaparro Valero Ciudad Politecnica de la Innovación iTEAM - Mobile Communications Group Polytechnic University of Valencia C\ Camino de Vera S/N, Edificio 8G 46022 Valencia, Spain