Is there logging established to show when a user logs in and logs off of a remote session?
Of course, you can find this information in the Host connection logs. This log records information about when this Host was accessed and in what connection mode, i.e. you're able to see the time when the remote session was started, e.g. you should normally see log entries such as (depending on a connection mode and whether Internet-ID or Direct connection was used): Remote screen connection. Started. Remote screen connection. Closed. Please note that, unfortunately, there are no username/hostname of the Viewer user displayed in the logs yet. However, we already plan to improve the information contained in the logs in our future updates.
It's also possible to check in the Viewer logs when the remote session was started. For more information on the Viewer log please refer to this page.