The CQ project at OGI, funded by DARPA, aims at developing a scalable toolkit and techniques for update monitoring and event-driven information delivery on the net. The main feature of the CQ project is a “personalized update monitoring” toolkit based on  continual queries  [3]. Comparing with the pure pull (such as DBMSs, various web search engines) and pure push (such as Pointcast, Marimba, Broadcast disks) technology, the CQ project can be seen as a hybrid approach that combines the pull and push technology by supporting personalized update monitoring through a combined client-pull and server-push paradigm.
['Ling Liu', 'Calton Pu', 'Wei Tang', 'David Buttler', 'John Biggs', 'Tong Zhou', 'Paul Benninghoff', 'Wei Han', 'Fenghua Yu']
CQ: a personalized update monitoring toolkit