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<HTML><TITLE>TCP/IP Networks and Event-Driven Programming</TITLE><BODY BGCOLOR="#FFF0E0" VLINK="#0FBD0F" TEXT="#101000" LINK="#0F0FDD">
<A NAME="top"><H1>TCP/IP Networks and Event-Driven Programming</H1>
<P> One reason for the current explosive growth in network applications is the
availability of good tools for creating them. The World Wide Web is possibly
the most important of these tools. It runs on a super network known as the
<CITE><NAME=#Ginternet>Internet</CITE>. This name reflects the fact that the Internet
connects disparate networks around the world. The Internet is an example of a
TCP/IP network.
<P> When companies use this technology within their proprietary networks, the
result is called an <CITE><NAME=#Gintranet>intranet</CITE>. When companies share an
information system based on this technology with suppliers or customers, the
result is called an <CITE><NAME=#Gextranet>extranet</CITE>.
<P> Tcl/Tk provides solid support for those of you who wish to write
applications based on this technology. This chapter introduces you to
client/server technology over TCP/IP networks as it is supported by Tcl.
Questions of how to provide security in an environment that passes scripts
from computer to computer are discussed in Chapter 21, "Security In a World
of Push."
<P> Because servers typically deal with many clients at once, they require a
style of programming that can schedule activities that will happen in
parallel. Event-driven programming fills this need. It is supported by Tcl
and is introduced in this chapter.
<UL>
<LI>
TCP/IP Networks as Seen from Tcl
<LI>
The World Wide Web as a Client/Server Application
<LI>
Creating a Web Client in Tcl
<LI>
The Event Loop
<LI>
Timeouts
<LI>
Background Error Handling
<LI>
Client/Server the Tcl Way
<LI>
More about the Event Loop
<LI>
The <TT>http</TT> Package
<LI>
A Brief HTML Introduction
<LI>
Solutions to Exercises
</UL>
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<P>
<I>Jun 17, 1998</I>
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