robots.txt is a file requested many times by bots like yahoo. It is assumed to be located at the root of web directory and to contain directives on which files and folders the search engine should be allowed or not to archive.
Generally, contents of /robots.txt should be something like :
User-agent : *
Disallow : UserSettings

If you want to know more about robots.txt and favicon.ico, search these terms with Google and add the definitions in this page.

The only thing I just want to say is about RewriteRule, see favicon.ico

Problems when WikkaWiki has its own domain

the text above does not mention that the default install rewrites requests for favicon.ico and robots.txt into wikka.php?wakka=robots.txt and wikka.php?wakka=favicon.ico, respectively.

one way to get around this is to change the last RewriteRule in wikka's .htaccess from this:

RewriteRule ^(.*)$ wikka.php?wakka=$1 [QSA,L]

To this:

RewriteCond %{REQUEST_FILENAME} !=/robots.txt
RewriteCond %{REQUEST_FILENAME} !=/favicon.ico
RewriteRule ^(.*)$ wikka.php?wakka=$1 [QSA,L]

Favicon consolidation

maybe you will also want to change
<link rel="icon" href="images/favicon.ico" type="image/x-icon" />
<link rel="shortcut icon" href="images/favicon.ico" type="image/x-icon" />

<link rel="icon" href="/favicon.ico" type="image/x-icon" />
<link rel="shortcut icon" href="/favicon.ico" type="image/x-icon" />

in actions/header.php .

Then move the favicon.ico file from Wikka's images directory to the main Wikka directory. This will place it at the domain root, where browsers expect it to be, and get all Wikka's pages to look for it there.

- Contributed by MinusF, edited by BaxilDragon

I'd also like to point out that if either robots.txt or favicon.ico don't exist, then you'll just get kicked over to 404.shtml (or whatever page your server uses to handle 404 errors) ... which will, surprise, get redirected to wikka.php?wakka=404.shtml. ;) To fix this, create a robots.txt file -- there's good example code at RobotFriendly and Mod033bRobotIndexing. The "Further consolidation" changes above will fix favicon.ico requests. - BaxilDragon

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