In order to keep pupils on task and prevent them getting distracted, you can lock down the screens of the computers.

Once you have logged into Senso you will probably be using the Thumbnail View. 

You can see the far left screen has an open document which could be causing a distraction.

Click on Select All

At this point it is important to UNTICK your own PC, in this case CHMS-ITA-TEACH

Now select Lock/Unlock Screen as below.

You will now have an extra set of options. Select Lock and then Run 

This will lock the screens of every computer in the room

To unlock the computers simply go through the same process but select Unlock instead of Lock, and then Run