Prevent leaving the Guest Player?

Hi All,

In addition to my other post on "isolated," is there some way I can prevent someone from closing the Guest operating system and dropping back to the Host?

My grand-kids often use the PC and I would like to restrict them to only having access to the XP-Player which I can start up for them.

Rebooting the PC into the Host OS is not a problem as they will not have the password access to that, so I think just locking them inside thew XP-Guest should do the trick.

Possible? How?

Thanks