Here are some suggestions.

• Use thumb-tacks so even if they push the "X" the window won't go away.
• Handcuff them. In severe recalcitrant cases you may have to resort to a straitjacket.
• Unplug the rat.
• Glue their hands to the keyboard.
• Use persuasion / threats. This is the "soft" solution!

Seriously, why? The users should be held responsible for their actions and damage they do on the computer. Conversely, they shoud be able to terminate a program if they judge it's necessary. You're dealing with sentient human beings, not baboons, right?

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