RSS aggregator in Flash Based Desktop (not webpg)

Hello everybody,

Am new here. I am in process of making a flash-based desktop application which aggregates RSS news feeds from various (customizable) websites.

Doing this with php or with support of a webpage is possible. Also some tutorials are available for the same.

I want guidelines on how to do it in flash w/o php or html support ?
I dont want the code for this, my request is for technical guidelines on how to and where to start.

Awaiting reply.