How to disable closing a window

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http://askubuntu.com – It might sound ridiculous, but I want to prevent closing a window in Ubuntu. I want to provide to my users a highly secure environment, without any desktop environment with just one window open. Now I want to make sure user can't close that window. Is there any way to hack around with compiz so that there is no way a user can close the window. Not by pressing close button, not by pressing alt+f4 etc.? I am open to use any window manager amongst those available in 12.04. Either of compiz, metacity, and others. I am also willing to hack around with source code if required. (HowTos)