How do you switch to Multi-User Mode?
a. Choose Company > Set Up Users and Passwords > Set Up Users from the menu.
b. Open the data file from a remote location.
c. Choose Edit > Preferences > Multi-User from the menu.
d. Choose File > Switch to Multi-user Mode from the menu.

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d. Choose File > Switch to Multi-user Mode from the menu.
Explanation:
When the file is in Multi-User Mode, more than one user can access the file (but they must all be using the same version of QuickBooks). There are certain activities that can only be performed in single-user mode (QuickBooks will alert you when this is the case), but anyone can access the file in single-user mode.
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