claim: Middlesex County is home to the city of Watertown, Massachusetts.
evidence: In computer and telecommunications networks , presence information is a status indicator that conveys ability and willingness of a potential communication partner -- for example a user -- to communicate .. computer. computer network. user. user ( computing ). communicate. communication. A user 's client provides presence information -LRB- presence state -RRB- via a network connection to a presence service , which is stored in what constitutes his personal availability record -LRB- called a presentity -RRB- and can be made available for distribution to other users -LRB- called watchers -RRB- to convey his availability for communication .. user. user ( computing ). client. client ( computing ). presence service. presence service. presentity. presentity. Presence information has wide application in many communication services and is one of the innovations driving the popularity of instant messaging or recent implementations of voice over IP clients .. instant messaging. instant messaging. voice over IP. voice over IP