CxS is an environment for developing and executing context-sensitive applications.

CxS enables these applications by composing data from various networked data sources, such as GPS devices, cell phones, badge readers, calendars, personal-computer activity monitors, and RFID readers.

CxS is designed to:

• scalably compose data from tens of millions of sources, on behalf of thousands of applications
• ensure privacy by allowing only authorized users to view data
• operate robustly in the face of data-source, network, and server failures
• simplify the development and maintenance of context-sensitive applications with a powerful programming model