Does anyone know at what point the wallet.dat is created?

Is this file created by the msi package process or is this file created when the blockchain has been downloaded?

I have a hypothesis that I need a little help with.
From my understanding each BitCoin wallet creates blocks of 100 addresses.  These addresses are unique to each wallet (or not?). 

My scenario runs as follows:

I have a clean system that has undergone a complete NTFS formating of all partitions.  To ensure security integrity all partitions have been reduced to one main partition.  The host is installed with Win 7 64 bit.  All drivers are installed excluding the network driver.  This will ensure no possible connection to the internet.  I have then installed the BitCoin-QT client.  I create a new address.  I then create my private key and secure my wallet.  This makes all necessary changes to the wallet and its security settings.  Now I have this address which was generated from the wallet without connecting to the blockchain.

To the question:

Can the address generated by the wallet be used in the block chain without every having the BitCoin-QT wallet connected to the network?

Can I send BitCoins to a generated address without having the wallet ever connect to the internet?