Hi,
There are many utilities/tools over the internet you can purchase in case if you wanted to monitor others screen. argosafe is one of that kind.
Just an additional note: It is not a good work ethics to monitor what employees are doing. You can give work to the employess and monitor thier performance by reviewing the work. I am not sure by monitoring what employees are doing what company will gain. In such companies people will not join or quit quickly.
Regards,
Asheej T K