PSYC is a push technology through and through.

Whenever we catch ourselves thinking in terms of query/retrieval systems or even negotiation, we stop and wonder if there is a push approach to the problem. Can we inform everyone who needs to know about it as it happens rather than have him ask, did it happen?

This goes well with our multicast routing strategies, which push information to multiple recipients in an optimized way. Also our subscription models are all about push.

Following this concept of event-orientedness consequently leads to surprisingly simple and clean solutions to otherwise impractical back and forth operations.

How the Real-Time Web Is Leaving Google Behind or How Internet Journalists Rediscover Push Technology Every Couple Of Years.
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See also