Is there a way to track when the Employees view their schedules or sign into When to Work?

You can tell if an Employee has viewed the latest version of a published schedule by going to your Schedules section using either "By Employee" or "Statistics" schedule views. That will show an eyeglass icon  to the right of their name if the Employee has viewed the latest version of that particular schedule week. You cannot tell the exact timestamp of when they viewed the schedule, but you can tell if it has been viewed since you last made changes to their schedule data.

Those views also allow you to see if the Employee was emailed their most current schedule or clicked to confirm receipt of that schedule email.

You can see the last time each Employee signed into their account by going to your Employees section and clicking the "Select Columns to View" link and checking the "last sign in" option then Update Display.

Also, you can see any particular Employee's last sign in by clicking their name from anywhere in our system to see their Employee Details popup then click the "Info" tab and it will show their last sign in along with their Employee information.