When you want to have more than one user accessing QuickBooks at the same time you are required to have the program set to Multi User Mode. To use QB in that mode, click on File, then select Switch to Multi User Mode. Now multiple users can access the same company file.
When you close and then re-open QuickBooks later, you have to repeat the steps, as QB has defaulted back to Single User Mode. How can we set it up so QB always opens in Multi User Mode?
With QB closed, press and hold the Ctrl key and then click to open QB. You will be at the Open Company File Window. Highlight the company you want to open, but do not open it yet. Click the check box at the bottom of the screen to Always Open in Multi User Mode. Then click the to open the highlighted company and it should already be in Multi User Mode.