Question about upgrading to Mountain Lion on two computers with two different users

I am running Lion on my MacBook Pro, and I intend to get the Mountain Lion upgrade. Someone else in my household has an aluminium iMac running Snow Leopard, so I was wondering how to upgrade that computer as well, considering that it has a different user with a separate Apple ID.
Can I open App Store and log in with my own ID temporarily to download the update? Or can I save the bandwidth and login-switching and burn an extracted installation disk image to a DVD and put that DVD into the iMac to upgrade from 10.6 to 10.8?

Yes you should be able to upgrade all the Macs you control in your home (including children at college) from one downloaded copy of Mountain Lion.  Just make sure you make a copy of the installer before attempting to install it on the first system, as the install process deletes the installer when finished, so you want that copy before the install starts or you need to download it again.
You can make an installer DVD, or you can copy the installer to the other Mac(s).
Also large capacity USB thumb drives are dirt cheap theses days (assuming you do some on-line shopping <http://dealmac.com>).  DVD is fine as well.

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