By edort on Aug 28, 2008
Comet is a programming technique that enables a server to push data to client browsers. The technique is often referred to as "reverse Ajax". RESTful web services are web services built using the Representational State Transfer (REST) architectural style. RESTful web services have come into widespread use because they tend to be lighter weight than SOAP-based web services.
Java Technology Evangelist, Carol McDonald, and Sun Staff Writer Rick Palkovic have written an interesting article that shows how RESTful web services with Comet can be used to produce an application in which the actions of one user affect the pages seen by other users. See RESTful Web Services and Comet.