If you want multiple people to share access to QuickBooks, you have to buy either multiple single-user licenses or a multi-user license.

How Many Computers Can QuickBooks Be Installed On?. Intuit's QuickBooks provides single- or multi-user access to a software package designed to enable businesses to track income and expenses with ...

In addition to multi-user functionality, QuickBooks 2011 users will also have the ability to set permissions in up to eight activity areas, spelling out what users do and don’t have access to.

The update includes a single fix for Intuit QuickBooks users looking to run in multi-user mode.