30.3 Whois Protocol
The Whois protocol is another information service. Although any site can provide a Whois server , the one at the InterNIC, rs.internic.net ,is most commonly used.
White Pages
Using the VRFY command of SMTP , along with the Finger protocol and the Whois protocol to locate users on the Internet is similar to using the white pages of a telephone book to find someone's phone number.
30.4 Archie, WAIS, Gopher, Veronica , and WWW
Archie
WAIS: Wide Area Information Servers
Gopher
Veronica: Very Easy Rodent-Oriented Netwide Index to Computerized Archives
WWW: World Wide Web
30.5 X Window System
The X window system, or just X, is a client-server application that lets multiple clients use the bit-mapped display managed by a server.
Xscope Program
A handy program for examining what's exchanged between an X client and its server is Xscope .
Low Bandwidth X
The encoding used by the X protocol is optimized for LANs, where the time spent encoding and decoding the data is more important than minimizing the amount of data transmitted.
30.1 Introduction
In this chapter we describe additional TCP/IP application that many implementations support.
30.2 Finger Protocol
The Finger protocol returns information on one or more users on a specified host. It's commonly used to see if someone is currently logged on , or to figure out someone's login name, to send them mail .
