Custom Icons in IE Favorites

[RSLancastr]

Usually, when I bookmark a web page in IE, the resulting "Favorite" has the standard IE icon.

Sometimes, it instead has a custom icon, obviously supplied by whoever created the web page being bookmarked.

Does anyone know how this is done? I've done a View Source on some pages which do this, and I don't see anything obvious.

Since looking into this, I have noticed that all the pages that do this seem to all be .php pages. This may be a coincidence, due to the small sample size.

Here is a link to a web page which does what I am talking about:

http://www.banff2004.com/includes/pages/program.php?p=3608

[Darat]

Don't you just put an icon called "favicon.ico" (16x16) in the website's root directory?

(Edited to add)

Here's a site with a short explanation:

http://www.attrition.org/attrition/how-favicon.html

Which reminds me of something.