If you would like to allow people to add a search box to there sites that will search your site and then bring them to your site for the results, it is easy to do.

This is your normal search form from your templates:

<form action="http://scripts.webmastersite.net/wsnlinks/wsnmanual410/search.php?filled=1&whichtype=all" method="post">
<input type="text" name="search" size="20">
<input type="submit" value="Search"></form>

This is the search all but you could copy and use any of the search forms from the advance search template.

Find this line in the form:
<form action="http://scripts.webmastersite.net/wsnlinks/wsnmanual410/search.php?filled=1&whichtype=all" method="post">
Simply change this part of the form and add:
<form action="http://scripts.webmastersite.net/wsnlinks/wsnmanual410/the full path to you directorysearch.php?filled=1&whichtype=all" method="post">

The allow you user to cut and paste this into their websites.