How can a CASTiNET user see a list of recent sigin-in activity?

Q: How can a CASTiNET user see a list of recent sigin-in activity?

A: CASTiNET users (and Office365 users) can review recent sign-in activity by going to this link: 

https://mysignins.microsoft.com/

(for office365 users this screen will show BOTH CASTiNET and O365 logins). 

keywords: sign-in signin login activity