Flash does not download web pages. It is a RIA UI (Rich Internet Application
User Interface) that can communicate with a server by sending data back and
forth, assets such as images and sound and additional Flash movies for more RIA
UI. So it is the "web page" or can be part of the traditional HTML/CSS web page
deployment.
To accomplish Flash web pages the user needs a Flash player running in a
browser is the best route. You need to be cautious with Flash player running
from OS and network security sandbox issues.
Flash can communicate with any web server.
You can have Flash read static files data files like XML or more likely
communicate with server scripts involving XML, URL Vars and web services
depending on your choice.
http://livedocs.macromedia.com/flash/8/main/00002879.html can be found in
Flash help and many discussions and examples in Flash Developers forum at
Adobe.com. The link also contains references to Flash sandbox security in case
you cannot use a web browser deployment of Flash and still want to pursue an OS
solution.