Can a single account be logged into more than once at the same time

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Firstly, please excuse me if this has already been asked - I tried searching for various terms but couldn't see anything.
At present we run a single account (non-admin) on our iMac G5 which holds all out families photos/music/movies etc. I'm wanting to add a MacBook to our iMac. They would communicate either wirelessly, or via an ethernet hub. We would like to fire up the laptop and log into that same account, so all that information is available (read and write) from both computers, and at the same time.
Is this possible? If so, how is it achieved. Is there some network settings that have to be made on the MacBook?
I'm aware that there will be limitations - i.e. two people won't be able to modify the same file at the same time. Also that the iMac will have to be powered up for the account to be accessed etc.
Finally, due to space considerations I'm wanting to move the home folder for our existing account onto an external FW drive (using the techniques I've found in other posts on this forum). Will this affect any solution to my original question?
Thanks for your time.

When you turn on file sharing, others can see your computer in the Finder > Go > Network window, where they can click on it to see what shares are available. These can be the public folders (which don't need a password to connect), or user folders (which do). By connecting to one of the shares, they then have access to the files within them. If you don't want to use an external disk, you can use SharePoints to share folders within your account, such as Music or Pictures. Just be aware that sharing files within a user account can run into permissions issues, for example trying to edit a document owned by someone else, which is one of the reasons to use an external disk. Tiger and Leopard also support Access Control Lists, but you need to know what you are doing.

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