236 lines
4.9 KiB
HTML
236 lines
4.9 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>How Does an Emulator Work?</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.60"><LINK
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REL="HOME"
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TITLE="SLIP/PPP Emulator mini-HOWTO"
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HREF="index.html"><LINK
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REL="PREVIOUS"
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TITLE="Introduction"
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HREF="intro.html"><LINK
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REL="NEXT"
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TITLE="Prerequisites"
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HREF="prerequisites.html"></HEAD
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><BODY
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CLASS="SECT1"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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WIDTH="100%"
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BORDER="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>SLIP/PPP Emulator mini-HOWTO</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="intro.html"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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></TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="prerequisites.html"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="HOW-DOES-IT-WORK"
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>2. How Does an Emulator Work?</A
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></H1
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><P
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> It is important to understand how a SLIP/PPP emulator works in
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general, to be aware of its limitations. First, you do not need to install
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the emulator on your machine. It runs on your remote host only. What you
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need on your machine is the TCP/IP and SLIP or PPP protocols installed in
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your kernel (more on that in a bit), and some clients.
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</P
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><P
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> Here's what happens: you send network requests from your machine
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to your remote host over the SLIP/PPP link. The emulator grabs them and
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sends them out to the Net at large. Then, incoming data is sent back from
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the Net to your account on the remote host, where the emulator grabs it
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and sends it back over the SLIP/PPP link to your machine. So, to the Net
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it appears as if you are working out of your account on the remote host,
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but to you it looks like you are really connected right to the Net.
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</P
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><P
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> As you can see, this can confuse stuff that is incoming from the
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Net. For example, talk doesn't work via an emulator, because the incoming
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talk request tries to start the remote hosts talk daemon, not yours.
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</P
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><P
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> The other big difference between an emulator and real SLIP/PPP is
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you are NOT assigned your own IP address; remember, you are only
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converting a dialup account to a SLIP/PPP connection.
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</P
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="WHAT-IS-TIA"
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>2.1. What is TIA?</A
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></H2
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><P
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> <A
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HREF="http://www.marketplace.com/tia/tiahome.html"
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TARGET="_top"
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>The Intenet Adaptor</A
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>
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was written by the fine folks at marketplace.com. They have
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quit working on it now, and consider it a 'mature' product. The last
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version is 2.05; if you are going to use TIA, please get this version.
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<DIV
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CLASS="NOTE"
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><BLOCKQUOTE
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CLASS="NOTE"
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><P
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><B
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>Note: </B
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> At last report, marketplace.com have gone out of business.
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</P
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></BLOCKQUOTE
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></DIV
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>
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="WHAT-IS-SLIRP"
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>2.2. What is SLiRP?</A
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></H2
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><P
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> This is a freeware application, covered under the GNU Public
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License. It is out of beta, and is real stable. It sports a few more
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features than TIA, and is (reportedly) easier on host resources.
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Available at fine Linux FTP sites everywhere.
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="WHAT-ABOUT-TERM"
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>2.3. What about Term?</A
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></H2
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><P
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> If you don't have root access to your machine for one reason or
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another, and you can't persuade someone who does to install SLIP and dip,
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then you won't have much choice except to use Term. If you want to know
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more about Term, please read the HOWTO on Sunsite.
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</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="WHAT-ABOUT-REAL-SLIP"
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>2.4. What about real SLIP/PPP?</A
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></H2
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><P
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> Hey, a lot of places are offering real SLIP/PPP at reasonable
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prices for non-dedicated dialup nowadays. If you can afford it, or feel
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the need, go for it. The Real Thing is always better than emulation.
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However, one of the things an emulator provides is security; it acts as
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an impregnable firewall, and with it you are pretty much as bulletproof
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as your provider is. You'll pay for it though, emulation is slower, and
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does not fully support every protocol. Still and all, emulation is good
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enough for most people, and is a fine way to connect to the Net.
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</P
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></DIV
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="intro.html"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="prerequisites.html"
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>Next</A
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></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>Introduction</TD
|
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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> </TD
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><TD
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WIDTH="33%"
|
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ALIGN="right"
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VALIGN="top"
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>Prerequisites</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
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> |