This is a dynamic search interface to the Lotusphere 2005 session information, as found in Ben Langhinrichs' Session Database. As you change your lookup parameters below, a request is sent in the background to the server to retrieve the relevant sessions.
This technique only works in "modern" browsers (IE 5+, Firefox, Safari). It uses XmlHttp requests to do the asynchronous lookups, just like Google Suggest and my Notes Suggest example database.