To monitor computer lab usage during lesson, teachers can use a program called LanSchool.
On the teachers machine, the LanSchool icon is present in the task bar A notification area (also system tray or status area) is the portion of the user interface that displays icons for system and program features that have no presence on the desktop. By default, this is located in the bottom-right of the primary monitor. The clock appears here, and applications can put icons in the notification area to indicate the status of an operation or to notify the user about an event.... More:
Click on the icon to show the LanSchool menu and then click on “LanSchool Console”
The following website details using the teacher console in class: