Are the addresses in my Wallet client considered to be all as only 1 account or wallet?
In the Bitcoin protocol and network there is no concept of "wallet" or "account". It only recognizes addresses. Whoever has the key corresponding to an address can spend the coins in it.

A wallet is merely a collection of addresses with their corresponding keys. The Bitcoin-qt client manages for you a wallet file on your computer. Every address in this wallet is spendable by you, so the software displays the total amount in all addresses as your balance. You don't really need to know how many coins are in each address, you just want to know how much you have in total.

I wouldn't say that the addresses "point" to a wallet as that would imply the wallet is a thing on its own. Note that you can have the same address in several wallets, but that's not recommended.

Some other software, such as Multibit, allow you to easily manage several wallet files, and see the total balance for each.