Disable/Remove Log Off from Task Manager

How to disable Log Off from Task Manager?

Want to play a prank on someone or learn it for your own use if someone plays the same prank on you or if any virus disables the Log Off button you can atleast get it back.

Follow these steps:
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* Start -> Run Type "gpedit.msc" (without quotes)

* Go to User Configuration -> Administrative Templates -> System -> Ctrl+Alt+Del Options

* In the right panel, you should see "Enable/Remove Logoff"

* Double click or right click it to change the settings

* That's it!