[Koha] Do a federated search in OPAC

Hello, Is there a way of making a fererated search in OPAC , or making the same federated search using an CMS like joomla or wordpress ? I have 10 koha libraries, each with its own instance and diferente server and database. I Need to implement something that searches all the kohas and merge the results in one place. Thanks for the help -- Pedro Ferreira