How compatible is using PATH_INFO?

From: Leif K-Brooks (eurleif_at_ecritters.biz)
Date: 11/28/03 

Date: Thu, 27 Nov 2003 20:24:46 -0500
To: php-general@lists.php.net

One common way to work around many search engines ignoring pages with
query strings is to use scripts with odd URIs
(http://server.com/foo.php/foo/bar for instance) and get them with
$_SERVER['PATH_INFO']. How compatible is doing that? Will servers
besides Apache support it?