JLog/JScriptLog - Prolog in Java*

Hi there,
I'm trying to implement a support site that will use jLogic to provide users a way of diagnosing and resolving their own issues. To aid this, I'm looking to extend the predicates with to include one that will open a web page, so we can provide links to technical support docs and the like.
Which interface or class should I be extend'ing and do the predicates need to be registered with the engine in some way ? My predicate would look something like :

openWebPage( 'http://www.google.com' ).

many thanks for your help

Simon Delicata