It's limited when it comes to the types of custom wikis it supports. For this, it simply appends "/wiki/" and then your search term (including "Special:Search/" if you select the "Search" linking method) to your custom wiki URL. This works if you're using Mediawiki (or I assume it works), but for something else like Tiki, it would be nice to be able to customize the output.
To make it work with a Tiki site, I ended up editing the plugin's php file to say just "/" instead of "/wiki/", and selected "direct link" linking method in the plugin's settings. Works like a charm.
On a side note, I really wish that there was a way to embed a wiki into a Joomla site.
thank you for the review.
the /wiki/ subdirectory was removed in the latest version of the plugin.