RSS info requested.

Hi, anyone can tell me where to find specific information about how RSS 'system' functions?.

I would want to know who 'control' and save which and how many feeds are downloaded by my reader. It's a reader parameter who controls it? or it's the feed server who controls it?


What I would wnat to do is any of these things:

-download a specific number of feeds (the last 20 or 50 or 100 or 200... feeds)​

-download feeds older than a given date​

-download specific feeds (whit specific 'number id' in url)​

I suspect it's reader who controls that. Because following instructions received in another forum I have tried with 'google reader' and today It has been able to download more than 460 feed (dates between today and 28/june/2008) and if I scroll down reaching the last one reader seems to continue downloading. On the other side Thunderbird only downloads 10 last feeds.

Any suggestion or link to follow and obtain info are very very welcome.

Sorry for my english and thank you in advance.

Saludos.

Rob.