[Boost-users] test an open port?

hi, how can i do a test before a data transmmision to know if a port is being used or not? thnaks -- 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