Private Test

Test user property and private cache

Session User

https://developers.google.com/apps-script/class_session

active user vs effective user

Private Cache

https://developers.google.com/apps-script/class_cacheservice

"Private caches are private to the current active user and script.

They can be used to store information specific to that user."

User Properties

https://developers.google.com/apps-script/class_userproperties

" Key:Value pairs associated with this user."

User property is always associated with the effective user