Hello dogbreath,
Avast is higly configurable.
There are indeed 6 providers or shields in the avast prog.
-instant messaging
-internet mail
-network
-outlook mail
-P2P
-standard
By splitting up your antivirus in 6 parts as Avast did, you can configure and set the protection levels for each part separate from the rest.
Now ain't that good for a freebee or what ?