Allow me to join in this thread, @wlcummings.
I'm here to share additional information on how QuickBooks Multi-User works.
A QuickBooks Server or host computer is where QuickBooks is installed and the company files are stored and shared on your network with other QuickBooks
users. This is used for customers who have more than one user license and running QuickBooks in multiuser mode.
Here's how to set it up:
For more details, you may check this guide: QuickBooks Desktop for Mac 2019 User's Guide ( Go to page 26.).
Don't hesitate to ping me if you have other questions about using QuickBooks Mac on a multi-user mode. I'm always here to help.