Website As Application Service Provider and Smart Access Point

So, a website is what serves webpages, right? Yes. And WAP, RSS, XML-RPC, URN-database-requests, SOAP, REST, API calls.

Oh.
And Web apps.
Oh.
How about all of these? Uh-oh.
I am pondering the flexibility of websites in light of:
http://go-pear.org
http://cheat.errtheblog.org