It's not advisable to use TurboTax or save any tax files on a removable drive, or a cloud-based drive. They can get corrupted and unusable.
No one can log in to their account through the TurboTax program you have installed on your computer. I would recommend skipping the registration page entirely for multiple users. It is not required to prepare a return.
Anyone using TurboTax on your computer is logged in as you.
Once you open TurboTax, anyone can 'start a new return' as you mention. However, they are logged into TurboTax as you.
@SLYKTAX
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