ajax - http packets in dynamic web pages -

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i want know in web pages yahoo every example 5 min news changes, send http packet server? if want implement feature ajax need send http packet again? can 1 explain dynamic structure(like updating news)for me.

you can find out what's going on on page: example use firefox , download firebug addon. open firebug after installation , open network tab. may have enable it. reload page in question, you'll see evere request made. , of course see timed requests done later update page. details pretty thorough.

this how firebug network tab looked after posting first paragraph of answer:

enter image description here


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