Lock the keyboard and mouse to stop those wandering little fingers.
Child Lock can be set to autolock after a period of inactivity, stops little fingers once you have left the PC. Can block out windows control keys, switch out of the current application (provided the app is running fullscreen such as a game). Can slow down the mouse, stop autorepeat assists young ones just getting used to a mouse and keyboard.
Locks all keys buttons effectively for those who never heard off this program before, or how to unlock.
Consider good imo for a free volunteering program.
Cons
Easy Bypass
Alt+Ctrl+Del still works even though PC is locked.
Can only fool a 5 year old child at best.
But slowly even the 5 year old child will learn "alt+end" is unlock.
Summary
Can only fool a 5 year old child at best as ctrl+alt+del still works. Can't change the method to unlock the com as well, slowly even the 5 year old child would learn, alt+end to unlock. They are at their learning age after all. Options panel apparently does nothing or I'm simply too stupid to know anything. It just pop out and hang there for 15 seconds and close itself. Full of holes that can only fool someone learning to use a computer for the first week.