Although network applications are diverse and have many interacting components, software is almostalways at their core. Recall from Section 1.2 that for a network application's software is distributed amongtwo or more end systems (i.e., host computers). For example, with the Web there are two pieces ofsoftware that communicate with each other: the browser software in the user's host (PC, Mac orworkstation), and the Web server software in the Web server. With Telnet, there are again two pieces ofsoftware in two hosts: software in the local host and software in the remote host. With multiparty videoconferencing, there is a software piece in each host that participates in the conference.
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