What does UAC actually stand for?
Dear @Colinb2
thank you for your question.
UAC stands for User Account Control and it's the "famous" pop-up that appears in Windows when you want to run tasks that require administrator privileges.
If you want more information please take a look here: https://en.wikipedia.org/wiki/User_Account_Control
If you want to know how to control it with TeamViewer please take a look here: https://community.teamviewer.com/t5/Knowledge-Base/Controlling-the-UAC-on-remote-Windows-PC/ta-p/25595
Take care,
Giovanni.