If you want to connect to citrix from outisde the office through your firewall then the citrix server needs configuring for an alternate connection. Here is a guide on how to setup citrix for external connections.
RSS is a way of keeping up to date with the latest updatres and posts on your favourite websites. If you run IE9 you can subscrive to RSS feeds. Here is a guide on how to subscribe to RSS feeds in internet explorer 9.