In addition to configuring settings in the farm, site collection and site levels you can also configure Ontolica Aggregate Center Web Parts. The core Web Part of an Ontolica Aggregate Center is the Ontolica Aggregate Results Web Part, which contains some key settings such as selection of Web applications, content types to be displayed, result templates, language selection, etc. To make changes go to an Ontolica Aggregate Center and click Site Actions > Edit Page. Then locate the Ontolica Aggregate Result Web Part and click on the Configure this Ontolica Aggregate Result Web Part link. That will open the Aggregate Result Web Part Settings page. The most important settings of the Web Part are located in the Fixed Search section.