TABLE 1: Redirection Variables
Variable*	Represents	Example
$S	The original URL's suffix	Original URL: http://server1/mydocs/doc1.html $S represents /mydocs/doc1.html
$P	The original URL's parameters	Original URL: http://server1/mydocs/doc1.html$s1=3 $P represents s1=3
$Q	The original URL's parameters plus the leading $	Original URL: http://server1/mydocs/doc1.html$s1=3 $Q represents $s1=3
$V	The original URL minus the server name and any parameters	Original URL: http://server1/mydocs/doc1.html$s1=3 $V represents /mydocs/doc1.html
* The dollar sign ($) tells IIS that what follows is a variable and not part of a URL or pathname.