In 3.x the Rss is initialized by RssProviderService. This happens in application restart. There is no event that triggers the service on a specific request. You can do this in 4.0 edition.
For Sitefinity 4.0
You can use the following code to run the pipe
var pipeGuid = new Guid(pointId);
where you can pass null for the provider name or the default one. As you can see you should know the rss id - pipe ID.
You can create a custom provider that inherits from the Open Access data provider implementation for the module you want to update.
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