Loosely Specified Protocol Only a few apls exist that permit an application to use TCP/IP protocol UNIX: socket APL, socket interface, or sockets MS Window: window sockets aT&T: acronym TLI CSIE NTUT TANANCSIE, NTUT, TAIWAN 6 Loosely Specified Protocol • Only a few APIs exist that permit an application to use TCP/IP protocol – UNIX: socket API, socket interface, or sockets – MS Window: window sockets – AT&T: acronym TLI