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  17       <h1 class="TITLE"><a name="AEN2" id="AEN2">Privoxy 3.0.27 User
  18       Manual</a></h1>
  19       <p class="PUBDATE"><sub><a href="copyright.html">Copyright</a> �
  20       2001-2017 by <a href="https://www.privoxy.org/" target="_top">Privoxy
  21       Developers</a></sub><br></p>
  22       <p class="PUBDATE">$Id: user-manual.sgml,v 2.222 2017/05/20 09:28:11
  23       fabiankeil Exp $<br></p>
  24       <div>
  25         <div class="ABSTRACT">
  26           <a name="AEN9" id="AEN9"></a>
  27           <p>The <i class="CITETITLE">Privoxy User Manual</i> gives users
  28           information on how to install, configure and use <a href=
  29           "https://www.privoxy.org/" target="_top">Privoxy</a>.</p>
  30           <p>Privoxy is a non-caching web proxy with advanced filtering
  31           capabilities for enhancing privacy, modifying web page data and
  32           HTTP headers, controlling access, and removing ads and other
  33           obnoxious Internet junk. Privoxy has a flexible configuration and
  34           can be customized to suit individual needs and tastes. It has
  35           application for both stand-alone systems and multi-user
  36           networks.</p>
  37           <p>Privoxy is Free Software and licensed under the GNU GPLv2.</p>
  38           <p>Privoxy is an associated project of Software in the Public
  39           Interest (SPI).</p>
  40           <p>Helping hands and donations are welcome:</p>
  41           <ul>
  42             <li>
  43               <p><a href=
  44               "https://www.privoxy.org/faq/general.html#PARTICIPATE" target=
  45               "_top">https://www.privoxy.org/faq/general.html#PARTICIPATE</a></p>
  46             </li>
  47             <li>
  48               <p><a href="https://www.privoxy.org/faq/general.html#DONATE"
  49               target=
  50               "_top">https://www.privoxy.org/faq/general.html#DONATE</a></p>
  51             </li>
  52           </ul>
  53           <p>You can find the latest version of the <i class=
  54           "CITETITLE">Privoxy User Manual</i> at <a href=
  55           "https://www.privoxy.org/user-manual/" target=
  56           "_top">https://www.privoxy.org/user-manual/</a>. Please see the
  57           <a href="contact.html">Contact section</a> on how to contact the
  58           developers.</p>
  59         </div>
  60       </div>
  61       <hr>
  62     </div>
  63     <div class="TOC">
  64       <dl>
  65         <dt><b>Table of Contents</b></dt>
  66         <dt>1. <a href="introduction.html">Introduction</a></dt>
  67         <dd>
  68           <dl>
  69             <dt>1.1. <a href="introduction.html#FEATURES">Features</a></dt>
  70           </dl>
  71         </dd>
  72         <dt>2. <a href="installation.html">Installation</a></dt>
  73         <dd>
  74           <dl>
  75             <dt>2.1. <a href="installation.html#INSTALLATION-PACKAGES">Binary
  76             Packages</a></dt>
  77             <dd>
  78               <dl>
  79                 <dt>2.1.1. <a href=
  80                 "installation.html#INSTALLATION-DEB">Debian and
  81                 Ubuntu</a></dt>
  82                 <dt>2.1.2. <a href=
  83                 "installation.html#INSTALLATION-PACK-WIN">Windows</a></dt>
  84                 <dt>2.1.3. <a href=
  85                 "installation.html#INSTALLATION-OS2">OS/2</a></dt>
  86                 <dt>2.1.4. <a href="installation.html#INSTALLATION-MAC">Mac
  87                 OS X</a></dt>
  88                 <dt>2.1.5. <a href=
  89                 "installation.html#OS-X-INSTALL-FROM-PACKAGE">Installation
  90                 from ready-built package</a></dt>
  91                 <dt>2.1.6. <a href=
  92                 "installation.html#OS-X-INSTALL-FROM-SOURCE">Installation
  93                 from source</a></dt>
  94                 <dt>2.1.7. <a href=
  95                 "installation.html#INSTALLATION-FREEBSD">FreeBSD</a></dt>
  96               </dl>
  97             </dd>
  98             <dt>2.2. <a href="installation.html#INSTALLATION-SOURCE">Building
  99             from Source</a></dt>
 100             <dt>2.3. <a href=
 101             "installation.html#INSTALLATION-KEEPUPDATED">Keeping your
 102             Installation Up-to-Date</a></dt>
 103           </dl>
 104         </dd>
 105         <dt>3. <a href="whatsnew.html">What's New in this Release</a></dt>
 106         <dd>
 107           <dl>
 108             <dt>3.1. <a href="whatsnew.html#UPGRADERSNOTE">Note to
 109             Upgraders</a></dt>
 110           </dl>
 111         </dd>
 112         <dt>4. <a href="quickstart.html">Quickstart to Using Privoxy</a></dt>
 113         <dd>
 114           <dl>
 115             <dt>4.1. <a href=
 116             "quickstart.html#QUICKSTART-AD-BLOCKING">Quickstart to Ad
 117             Blocking</a></dt>
 118           </dl>
 119         </dd>
 120         <dt>5. <a href="startup.html">Starting Privoxy</a></dt>
 121         <dd>
 122           <dl>
 123             <dt>5.1. <a href="startup.html#START-DEBIAN">Debian</a></dt>
 124             <dt>5.2. <a href="startup.html#START-FREEBSD">FreeBSD and
 125             ElectroBSD</a></dt>
 126             <dt>5.3. <a href="startup.html#START-WINDOWS">Windows</a></dt>
 127             <dt>5.4. <a href="startup.html#START-UNICES">Generic instructions
 128             for Unix derivates (Solaris, NetBSD, HP-UX etc.)</a></dt>
 129             <dt>5.5. <a href="startup.html#START-OS2">OS/2</a></dt>
 130             <dt>5.6. <a href="startup.html#START-MACOSX">Mac OS X</a></dt>
 131             <dt>5.7. <a href="startup.html#CMDOPTIONS">Command Line
 132             Options</a></dt>
 133           </dl>
 134         </dd>
 135         <dt>6. <a href="configuration.html">Privoxy Configuration</a></dt>
 136         <dd>
 137           <dl>
 138             <dt>6.1. <a href=
 139             "configuration.html#CONTROL-WITH-WEBBROWSER">Controlling Privoxy
 140             with Your Web Browser</a></dt>
 141             <dt>6.2. <a href="configuration.html#CONFOVERVIEW">Configuration
 142             Files Overview</a></dt>
 143           </dl>
 144         </dd>
 145         <dt>7. <a href="config.html">The Main Configuration File</a></dt>
 146         <dd>
 147           <dl>
 148             <dt>7.1. <a href="config.html#LOCAL-SET-UP">Local Set-up
 149             Documentation</a></dt>
 150             <dd>
 151               <dl>
 152                 <dt>7.1.1. <a href=
 153                 "config.html#USER-MANUAL">user-manual</a></dt>
 154                 <dt>7.1.2. <a href=
 155                 "config.html#TRUST-INFO-URL">trust-info-url</a></dt>
 156                 <dt>7.1.3. <a href=
 157                 "config.html#ADMIN-ADDRESS">admin-address</a></dt>
 158                 <dt>7.1.4. <a href=
 159                 "config.html#PROXY-INFO-URL">proxy-info-url</a></dt>
 160               </dl>
 161             </dd>
 162             <dt>7.2. <a href="config.html#CONF-LOG-LOC">Configuration and Log
 163             File Locations</a></dt>
 164             <dd>
 165               <dl>
 166                 <dt>7.2.1. <a href="config.html#CONFDIR">confdir</a></dt>
 167                 <dt>7.2.2. <a href="config.html#TEMPLDIR">templdir</a></dt>
 168                 <dt>7.2.3. <a href=
 169                 "config.html#TEMPORARY-DIRECTORY">temporary-directory</a></dt>
 170                 <dt>7.2.4. <a href="config.html#LOGDIR">logdir</a></dt>
 171                 <dt>7.2.5. <a href=
 172                 "config.html#ACTIONSFILE">actionsfile</a></dt>
 173                 <dt>7.2.6. <a href=
 174                 "config.html#FILTERFILE">filterfile</a></dt>
 175                 <dt>7.2.7. <a href="config.html#LOGFILE">logfile</a></dt>
 176                 <dt>7.2.8. <a href="config.html#TRUSTFILE">trustfile</a></dt>
 177               </dl>
 178             </dd>
 179             <dt>7.3. <a href="config.html#DEBUGGING">Debugging</a></dt>
 180             <dd>
 181               <dl>
 182                 <dt>7.3.1. <a href="config.html#DEBUG">debug</a></dt>
 183                 <dt>7.3.2. <a href=
 184                 "config.html#SINGLE-THREADED">single-threaded</a></dt>
 185                 <dt>7.3.3. <a href="config.html#HOSTNAME">hostname</a></dt>
 186               </dl>
 187             </dd>
 188             <dt>7.4. <a href="config.html#ACCESS-CONTROL">Access Control and
 189             Security</a></dt>
 190             <dd>
 191               <dl>
 192                 <dt>7.4.1. <a href=
 193                 "config.html#LISTEN-ADDRESS">listen-address</a></dt>
 194                 <dt>7.4.2. <a href="config.html#TOGGLE">toggle</a></dt>
 195                 <dt>7.4.3. <a href=
 196                 "config.html#ENABLE-REMOTE-TOGGLE">enable-remote-toggle</a></dt>
 197                 <dt>7.4.4. <a href=
 198                 "config.html#ENABLE-REMOTE-HTTP-TOGGLE">enable-remote-http-toggle</a></dt>
 199                 <dt>7.4.5. <a href=
 200                 "config.html#ENABLE-EDIT-ACTIONS">enable-edit-actions</a></dt>
 201                 <dt>7.4.6. <a href=
 202                 "config.html#ENFORCE-BLOCKS">enforce-blocks</a></dt>
 203                 <dt>7.4.7. <a href="config.html#ACLS">ACLs: permit-access and
 204                 deny-access</a></dt>
 205                 <dt>7.4.8. <a href=
 206                 "config.html#BUFFER-LIMIT">buffer-limit</a></dt>
 207                 <dt>7.4.9. <a href=
 208                 "config.html#ENABLE-PROXY-AUTHENTICATION-FORWARDING">enable-proxy-authentication-forwarding</a></dt>
 209                 <dt>7.4.10. <a href=
 210                 "config.html#TRUSTED-CGI-REFERER">trusted-cgi-referer</a></dt>
 211               </dl>
 212             </dd>
 213             <dt>7.5. <a href="config.html#FORWARDING">Forwarding</a></dt>
 214             <dd>
 215               <dl>
 216                 <dt>7.5.1. <a href="config.html#FORWARD">forward</a></dt>
 217                 <dt>7.5.2. <a href="config.html#SOCKS">forward-socks4,
 218                 forward-socks4a, forward-socks5 and forward-socks5t</a></dt>
 219                 <dt>7.5.3. <a href=
 220                 "config.html#ADVANCED-FORWARDING-EXAMPLES">Advanced
 221                 Forwarding Examples</a></dt>
 222                 <dt>7.5.4. <a href=
 223                 "config.html#FORWARDED-CONNECT-RETRIES">forwarded-connect-retries</a></dt>
 224               </dl>
 225             </dd>
 226             <dt>7.6. <a href="config.html#MISC">Miscellaneous</a></dt>
 227             <dd>
 228               <dl>
 229                 <dt>7.6.1. <a href=
 230                 "config.html#ACCEPT-INTERCEPTED-REQUESTS">accept-intercepted-requests</a></dt>
 231                 <dt>7.6.2. <a href=
 232                 "config.html#ALLOW-CGI-REQUEST-CRUNCHING">allow-cgi-request-crunching</a></dt>
 233                 <dt>7.6.3. <a href=
 234                 "config.html#SPLIT-LARGE-FORMS">split-large-forms</a></dt>
 235                 <dt>7.6.4. <a href=
 236                 "config.html#KEEP-ALIVE-TIMEOUT">keep-alive-timeout</a></dt>
 237                 <dt>7.6.5. <a href=
 238                 "config.html#TOLERATE-PIPELINING">tolerate-pipelining</a></dt>
 239                 <dt>7.6.6. <a href=
 240                 "config.html#DEFAULT-SERVER-TIMEOUT">default-server-timeout</a></dt>
 241                 <dt>7.6.7. <a href=
 242                 "config.html#CONNECTION-SHARING">connection-sharing</a></dt>
 243                 <dt>7.6.8. <a href=
 244                 "config.html#SOCKET-TIMEOUT">socket-timeout</a></dt>
 245                 <dt>7.6.9. <a href=
 246                 "config.html#MAX-CLIENT-CONNECTIONS">max-client-connections</a></dt>
 247                 <dt>7.6.10. <a href=
 248                 "config.html#HANDLE-AS-EMPTY-DOC-RETURNS-OK">handle-as-empty-doc-returns-ok</a></dt>
 249                 <dt>7.6.11. <a href=
 250                 "config.html#ENABLE-COMPRESSION">enable-compression</a></dt>
 251                 <dt>7.6.12. <a href=
 252                 "config.html#COMPRESSION-LEVEL">compression-level</a></dt>
 253                 <dt>7.6.13. <a href=
 254                 "config.html#CLIENT-HEADER-ORDER">client-header-order</a></dt>
 255                 <dt>7.6.14. <a href=
 256                 "config.html#CLIENT-SPECIFIC-TAG">client-specific-tag</a></dt>
 257                 <dt>7.6.15. <a href=
 258                 "config.html#CLIENT-TAG-LIFETIME">client-tag-lifetime</a></dt>
 259                 <dt>7.6.16. <a href=
 260                 "config.html#TRUST-X-FORWARDED-FOR">trust-x-forwarded-for</a></dt>
 261                 <dt>7.6.17. <a href=
 262                 "config.html#RECEIVE-BUFFER-SIZE">receive-buffer-size</a></dt>
 263               </dl>
 264             </dd>
 265             <dt>7.7. <a href="config.html#WINDOWS-GUI">Windows GUI
 266             Options</a></dt>
 267           </dl>
 268         </dd>
 269         <dt>8. <a href="actions-file.html">Actions Files</a></dt>
 270         <dd>
 271           <dl>
 272             <dt>8.1. <a href="actions-file.html#RIGHT-MIX">Finding the Right
 273             Mix</a></dt>
 274             <dt>8.2. <a href="actions-file.html#HOW-TO-EDIT">How to
 275             Edit</a></dt>
 276             <dt>8.3. <a href="actions-file.html#ACTIONS-APPLY">How Actions
 277             are Applied to Requests</a></dt>
 278             <dt>8.4. <a href=
 279             "actions-file.html#AF-PATTERNS">Patterns</a></dt>
 280             <dd>
 281               <dl>
 282                 <dt>8.4.1. <a href="actions-file.html#HOST-PATTERN">The Host
 283                 Pattern</a></dt>
 284                 <dt>8.4.2. <a href="actions-file.html#PATH-PATTERN">The Path
 285                 Pattern</a></dt>
 286                 <dt>8.4.3. <a href="actions-file.html#TAG-PATTERN">The
 287                 Request Tag Pattern</a></dt>
 288                 <dt>8.4.4. <a href=
 289                 "actions-file.html#NEGATIVE-TAG-PATTERNS">The Negative
 290                 Request Tag Patterns</a></dt>
 291                 <dt>8.4.5. <a href="actions-file.html#CLIENT-TAG-PATTERN">The
 292                 Client Tag Pattern</a></dt>
 293               </dl>
 294             </dd>
 295             <dt>8.5. <a href="actions-file.html#ACTIONS">Actions</a></dt>
 296             <dd>
 297               <dl>
 298                 <dt>8.5.1. <a href=
 299                 "actions-file.html#ADD-HEADER">add-header</a></dt>
 300                 <dt>8.5.2. <a href="actions-file.html#BLOCK">block</a></dt>
 301                 <dt>8.5.3. <a href=
 302                 "actions-file.html#CHANGE-X-FORWARDED-FOR">change-x-forwarded-for</a></dt>
 303                 <dt>8.5.4. <a href=
 304                 "actions-file.html#CLIENT-HEADER-FILTER">client-header-filter</a></dt>
 305                 <dt>8.5.5. <a href=
 306                 "actions-file.html#CLIENT-HEADER-TAGGER">client-header-tagger</a></dt>
 307                 <dt>8.5.6. <a href=
 308                 "actions-file.html#CONTENT-TYPE-OVERWRITE">content-type-overwrite</a></dt>
 309                 <dt>8.5.7. <a href=
 310                 "actions-file.html#CRUNCH-CLIENT-HEADER">crunch-client-header</a></dt>
 311                 <dt>8.5.8. <a href=
 312                 "actions-file.html#CRUNCH-IF-NONE-MATCH">crunch-if-none-match</a></dt>
 313                 <dt>8.5.9. <a href=
 314                 "actions-file.html#CRUNCH-INCOMING-COOKIES">crunch-incoming-cookies</a></dt>
 315                 <dt>8.5.10. <a href=
 316                 "actions-file.html#CRUNCH-SERVER-HEADER">crunch-server-header</a></dt>
 317                 <dt>8.5.11. <a href=
 318                 "actions-file.html#CRUNCH-OUTGOING-COOKIES">crunch-outgoing-cookies</a></dt>
 319                 <dt>8.5.12. <a href=
 320                 "actions-file.html#DEANIMATE-GIFS">deanimate-gifs</a></dt>
 321                 <dt>8.5.13. <a href=
 322                 "actions-file.html#DOWNGRADE-HTTP-VERSION">downgrade-http-version</a></dt>
 323                 <dt>8.5.14. <a href=
 324                 "actions-file.html#EXTERNAL-FILTER">external-filter</a></dt>
 325                 <dt>8.5.15. <a href=
 326                 "actions-file.html#FAST-REDIRECTS">fast-redirects</a></dt>
 327                 <dt>8.5.16. <a href=
 328                 "actions-file.html#FILTER">filter</a></dt>
 329                 <dt>8.5.17. <a href=
 330                 "actions-file.html#FORCE-TEXT-MODE">force-text-mode</a></dt>
 331                 <dt>8.5.18. <a href=
 332                 "actions-file.html#FORWARD-OVERRIDE">forward-override</a></dt>
 333                 <dt>8.5.19. <a href=
 334                 "actions-file.html#HANDLE-AS-EMPTY-DOCUMENT">handle-as-empty-document</a></dt>
 335                 <dt>8.5.20. <a href=
 336                 "actions-file.html#HANDLE-AS-IMAGE">handle-as-image</a></dt>
 337                 <dt>8.5.21. <a href=
 338                 "actions-file.html#HIDE-ACCEPT-LANGUAGE">hide-accept-language</a></dt>
 339                 <dt>8.5.22. <a href=
 340                 "actions-file.html#HIDE-CONTENT-DISPOSITION">hide-content-disposition</a></dt>
 341                 <dt>8.5.23. <a href=
 342                 "actions-file.html#HIDE-IF-MODIFIED-SINCE">hide-if-modified-since</a></dt>
 343                 <dt>8.5.24. <a href=
 344                 "actions-file.html#HIDE-FROM-HEADER">hide-from-header</a></dt>
 345                 <dt>8.5.25. <a href=
 346                 "actions-file.html#HIDE-REFERRER">hide-referrer</a></dt>
 347                 <dt>8.5.26. <a href=
 348                 "actions-file.html#HIDE-USER-AGENT">hide-user-agent</a></dt>
 349                 <dt>8.5.27. <a href=
 350                 "actions-file.html#LIMIT-CONNECT">limit-connect</a></dt>
 351                 <dt>8.5.28. <a href=
 352                 "actions-file.html#LIMIT-COOKIE-LIFETIME">limit-cookie-lifetime</a></dt>
 353                 <dt>8.5.29. <a href=
 354                 "actions-file.html#PREVENT-COMPRESSION">prevent-compression</a></dt>
 355                 <dt>8.5.30. <a href=
 356                 "actions-file.html#OVERWRITE-LAST-MODIFIED">overwrite-last-modified</a></dt>
 357                 <dt>8.5.31. <a href=
 358                 "actions-file.html#REDIRECT">redirect</a></dt>
 359                 <dt>8.5.32. <a href=
 360                 "actions-file.html#SERVER-HEADER-FILTER">server-header-filter</a></dt>
 361                 <dt>8.5.33. <a href=
 362                 "actions-file.html#SERVER-HEADER-TAGGER">server-header-tagger</a></dt>
 363                 <dt>8.5.34. <a href=
 364                 "actions-file.html#SESSION-COOKIES-ONLY">session-cookies-only</a></dt>
 365                 <dt>8.5.35. <a href=
 366                 "actions-file.html#SET-IMAGE-BLOCKER">set-image-blocker</a></dt>
 367                 <dt>8.5.36. <a href=
 368                 "actions-file.html#SUMMARY">Summary</a></dt>
 369               </dl>
 370             </dd>
 371             <dt>8.6. <a href="actions-file.html#ALIASES">Aliases</a></dt>
 372             <dt>8.7. <a href="actions-file.html#ACT-EXAMPLES">Actions Files
 373             Tutorial</a></dt>
 374             <dd>
 375               <dl>
 376                 <dt>8.7.1. <a href=
 377                 "actions-file.html#MATCH-ALL">match-all.action</a></dt>
 378                 <dt>8.7.2. <a href=
 379                 "actions-file.html#DEFAULT-ACTION">default.action</a></dt>
 380                 <dt>8.7.3. <a href=
 381                 "actions-file.html#USER-ACTION">user.action</a></dt>
 382               </dl>
 383             </dd>
 384           </dl>
 385         </dd>
 386         <dt>9. <a href="filter-file.html">Filter Files</a></dt>
 387         <dd>
 388           <dl>
 389             <dt>9.1. <a href="filter-file.html#FILTER-FILE-TUT">Filter File
 390             Tutorial</a></dt>
 391             <dt>9.2. <a href="filter-file.html#PREDEFINED-FILTERS">The
 392             Pre-defined Filters</a></dt>
 393             <dt>9.3. <a href=
 394             "filter-file.html#EXTERNAL-FILTER-SYNTAX">External filter
 395             syntax</a></dt>
 396           </dl>
 397         </dd>
 398         <dt>10. <a href="templates.html">Privoxy's Template Files</a></dt>
 399         <dt>11. <a href="contact.html">Contacting the Developers, Bug
 400         Reporting and Feature Requests</a></dt>
 401         <dd>
 402           <dl>
 403             <dt>11.1. <a href="contact.html#SUFFICIENT-INFORMATION">Please
 404             provide sufficient information</a></dt>
 405             <dt>11.2. <a href="contact.html#CONTACT-SUPPORT">Get
 406             Support</a></dt>
 407             <dt>11.3. <a href="contact.html#REPORTING">Reporting
 408             Problems</a></dt>
 409             <dd>
 410               <dl>
 411                 <dt>11.3.1. <a href="contact.html#CONTACT-ADS">Reporting Ads
 412                 or Other Configuration Problems</a></dt>
 413                 <dt>11.3.2. <a href="contact.html#CONTACT-BUGS">Reporting
 414                 Bugs</a></dt>
 415               </dl>
 416             </dd>
 417             <dt>11.4. <a href="contact.html#SECURITY-CONTACT">Reporting
 418             security problems</a></dt>
 419             <dt>11.5. <a href="contact.html#MAILING-LISTS">Mailing
 420             Lists</a></dt>
 421             <dt>11.6. <a href="contact.html#SF-TRACKERS">SourceForge support
 422             trackers</a></dt>
 423           </dl>
 424         </dd>
 425         <dt>12. <a href="copyright.html">Privoxy Copyright, License and
 426         History</a></dt>
 427         <dd>
 428           <dl>
 429             <dt>12.1. <a href="copyright.html#LICENSE">License</a></dt>
 430             <dt>12.2. <a href="copyright.html#HISTORY">History</a></dt>
 431             <dt>12.3. <a href="copyright.html#AUTHORS">Authors</a></dt>
 432           </dl>
 433         </dd>
 434         <dt>13. <a href="seealso.html">See Also</a></dt>
 435         <dt>14. <a href="appendix.html">Appendix</a></dt>
 436         <dd>
 437           <dl>
 438             <dt>14.1. <a href="appendix.html#REGEX">Regular
 439             Expressions</a></dt>
 440             <dt>14.2. <a href="appendix.html#INTERNAL-PAGES">Privoxy's
 441             Internal Pages</a></dt>
 442             <dt>14.3. <a href="appendix.html#CHAIN">Chain of Events</a></dt>
 443             <dt>14.4. <a href="appendix.html#ACTIONSANAT">Troubleshooting:
 444             Anatomy of an Action</a></dt>
 445           </dl>
 446         </dd>
 447       </dl>
 448     </div>
 449   </div>
 450   <div class="NAVFOOTER">
 451     <hr align="left" width="100%">
 452     <table summary="Footer navigation table" width="100%" border="0"
 453     cellpadding="0" cellspacing="0">
 454       <tr>
 455         <td width="33%" align="left" valign="top">&nbsp;</td>
 456         <td width="34%" align="center" valign="top">&nbsp;</td>
 457         <td width="33%" align="right" valign="top"><a href=
 458         "introduction.html" accesskey="N">Next</a></td>
 459       </tr>
 460       <tr>
 461         <td width="33%" align="left" valign="top">&nbsp;</td>
 462         <td width="34%" align="center" valign="top">&nbsp;</td>
 463         <td width="33%" align="right" valign="top">Introduction</td>
 464       </tr>
 465     </table>
 466   </div>
 467 </body>
 468 </html>