How to use Craigslist RSS in a search application?: RSS Parse

How to use Craigslist RSS in a search application?

I'd like to write an application that moniitors CL for for various items. I've experimented with pulling down listings, as shown in the code below, based on sample code I found posted. The code may or may not be the best way of doing this, as I've never used RSS before and a few things are unclear to me:

1. Exactly what comes down in an RSS? Only the TOP N listings? New listings, since the last time? It doesn't seem to retrieve a lot. Is it the typical CL page? How would I get "more"?
2. What's it mean by "subscribe"? Does the server track my subscription and try to PUSH, or does it simply mean the client application (my code) does all the work to PULL data?
3. Is there a way to pass searches to CL to alter the returned RSS, or do I pull everything down and then search through it?

I haven't found anything hel,pful on CL's site.

Thank you.

private void ReadData()
{
    XmlDocument XMLDoc = new System.Xml.XmlDocument();
    XMLDoc.Load("http://boston.craigslist.org/tls/index.rss");
 
    XmlNameTable nTable  = XMLDoc.NameTable;
    XmlNamespaceManager nsManager  = new XmlNamespaceManager(nTable); 
 
    nsManager.AddNamespace("rdf", "http://www.w3.org/1999/02/22-rdf-syntax-ns#") ;
    nsManager.AddNamespace("item", "http://purl.org/rss/1.0/") ;
    nsManager.AddNamespace("dc", "http://purl.org/dc/elements/1.1/") ;
    XmlNodeList XMLItems = XMLDoc.DocumentElement.SelectNodes("//rdf:RDF/item:item", nsManager) ;
 
    /*
     * items/ 
     * 
     * 
     * 
     */
     
    foreach (XmlNode currentItem in XMLItems)
    {
        string date = DateTime.Parse(currentItem.SelectSingleNode("dc:date", nsManager).InnerText).ToString("MMM-dd hh:mm");
        string title = currentItem.SelectSingleNode("item:title", nsManager).InnerText;
        string link = currentItem.SelectSingleNode("item:link", nsManager).InnerText;
        string description = currentItem.SelectSingleNode("item:description", nsManager).InnerText;
 
        Listing listing = new Listing() { Date = date, Description = description, Title = title, Link = link };
 
        CleanListing(listing);
 
        _listings.Add(listing);
    }
 
}
 
private void CleanListing(Listing listing)
{
    listing.Description = listing.Description.Replace("\r\n<br>", "");
    listing.Description = listing.Description.Replace("<br>", "");
    listing.Description = listing.Description.Trim();
}

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