This patch allows a user to show changes since his last visit.
The information is stored in a cookie and kann be addressed 
at wiki.pl?action=rc&sincelastvisit=1
Hacked by the teenagemutantninjaheroecoders - http://c0re.jp/
--- wiki.cgi.orig	Wed Aug 29 14:37:51 2001
+++ wiki.cgi	Wed Aug 29 15:53:23 2001
@@ -463,6 +463,14 @@
   $fullHtml .= &WikiToHTML($Text{'text'});
   $fullHtml .= "<hr>\n"  if (!&GetParam('embed', $EmbedWiki));
   if (($id eq $RCName) || (T($RCName) eq $id) || (T($id) eq $RCName)) {
+
+    if (&GetParam("sincelastvisit", 0)) {
+        my $cookie1 = $q->cookie(-name       => $CookieName . "-RC",
+                                 -value   => time(),
+                                 -expires => '+60d');
+        print "Set-Cookie: $cookie1\r\n";
+    }
+
     print $fullHtml;
     &DoRc();
     print "<hr>\n"  if (!&GetParam('embed', $EmbedWiki));
@@ -492,7 +500,10 @@
   my $starttime = 0;
   my $showbar = 0;
 
-  if (&GetParam("from", 0)) {
+  if (&GetParam("sincelastvisit", 0)) {
+    $starttime = $q->cookie($CookieName."-RC");
+
+  } elsif (&GetParam("from", 0)) {
     $starttime = &GetParam("from", 0);
     print "<h2>" . Ts('Updates since %s', &TimeToText($starttime))
           . "</h2>\n";