The need of a data stream management system (DSMS), with the capability of querying continuous data streams, has been well understood by the database research community and witnessed by a proliferation of related publications in this area (see, e.g., for a partial survey). Examples of applications abound in many domains: from environmental and military applications consuming streams of sensor data, to telecommunications and data network assurance systems analyzing real-time network traffic data. This article provides an overview on a DSMS prototype called T2. T2 inherits some of the concepts of an early prototype, Tribeca, developed also at Telcordia, but with complete new design and implementation in Java with an SQL-like query language.