Use Mac While Mountain Lion Is Downloading?

Hello,
Does anyone know if you can actively use your Mac while Mac OS 10.8 is downloading? More importantly, does the installer require a manual prompt before the actual installation process?
I would normally be able to leave my MacBook Pro alone while it downloaded/installed such an OS upgrade, but am in a bit of a bind with work for the next few days and bound by a much slower Internet connection, so the download process could take almost a day! It would be a pain in the a** to suddenly loose functionality at a critical time. Oh, how I miss the old days of installer discs and the ability to manage software installation more efficiently...
More microchips than sense,
Dr. Z.

If you are using a slow internet connection to download Mountain Lion, best to not use your Mac at the same time to free up system resources. It's a 4.34GB file. If your download sped is approximately 15Mbps, that takes about 2 and a half hours. Anything less, then the download could time out before it's finished.
Keep in mind, if you need to repair the startup disk or reinstall the OS X, you would need to use Lion Recovery which requires broadband (high speed) access to the internet via Wi-Fi or an Ethernet connection.
how I miss the old days of installer discs and the ability to manage software installation more efficiently...
How to create an OS X 10.8 Mountain Lion install drive | MacFixIt - CNET Reviews

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