Active Sessions / Session Logs

Is there a way to see currently active client sessions from the Router? How about past sessions that are now closed?

What do you mean by „sessions“?
Connected devices? Wi-Fi devices?

Wow, I must have been really tired when I posted this! VPN sessions. I am wondering if there is a way to show currently active, or recent, VPN sessions.

Sorry for the really badly worded question.

B