If you want to monitor when individuals are accessing Arbor, or if your staff have been able to access Arbor, you can!
Go to the System Engagement section of their staff profile. This will show you the times and dates for the last 50 times they logged in.
You'll need to create a custom report about Staff - you can see how to make one here: Creating a report in Custom Report Writer. In step 3, you will need to add the Last Login column.
Your report will then show a row for each staff member. It'll be blank if they've never logged in, or will show the last date and time they logged in.