Hello there.
I am looking for a way to hide the system tray notification programs, when the standard method (right click task bar, properties, notification area...) does not work.
I've tried doing it this way (logged in as an admin user) but when another using logs in, the setting does not apply do them and the notification is still present.

Is there another way to do this, so the change has a system wide effect?

OS is Windows 8
If it helps, the program I want to do this for is Input Director (very handy tool, but I don't want students to be able to simply close it from the system tray).