How the RSS readers know the New Posts?

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How the RSS readers know the New Posts?

visu

6:41 am on Nov 6, 2008 (gmt 0)

hey anyone tell me how the RSS FEED readers like Google, Yahoo get to know and display the new posts in a RSS feed? Wat kind of approach they might be using on their side ? is tat something like pinging the RSS feed urls at regular intervals to get the latest post?

Regards
V.

bill

7:41 am on Nov 6, 2008 (gmt 0)

They generally scan your subscribed feeds at a scheduled interval. Like most feed aggregators they wait a set number of minutes between each check. I don't know the interval for the online services, but it may be safe to assume that they go out and check each time you log in.