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Just learning about this via youtube but could not find answer to my question of how reader knows there is an update.
Is it like a Push in blackberry?
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RSS aggregators automatically check a series of RSS feeds for new items on an ongoing basis, making it is possible to keep track of changes to multiple Web sites without needing to tediously read and re-read each of the Web sites yourself.
The lag time between posting a story and seeing it pop up in the RSS feed is usually a few minutes, and then it can take another 10 to 15 minutes or so for it to appear in something like Google Reader. And the TechCrunch feed is probably checked more frequently for updates than most other feeds.
RSS feeds are published and updated in real time, so if you subscribe to a site's RSS feed, you'll always have access to the newest published content. That can be handy for news sites and podcasts that are frequently updated.
RSS is a file format source and doesn't actually know anything about where it gets the entries from. The answer really is: "how can an http request get only the newest results from a server" and the answer is Conditional GET source. Http also supports Conditional PUT.
This is an article about using this feature of http to specifically support rss hackers.
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