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Hmm, it's a very long time ago that I pressed that key combination. I tried it out, and apparently it is wired to the Logout function of KDE...

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Yeah- it was a pretty standard thing in Desktop Managers for a while for <C-Alt-Del> to be logout (or return to DM, depending on what you're using). I think GDM 3.0+ finally threw it out, but you'll still see it in KDM, LightDM, and Slim.

It's not even universal across all KDM et al installs. None of my Arch + KDE4 log out when using ctr+alt+del.

On a side note, ctr+alt+backspace used to kill Xorg (still can if you enabled it - but these days that shortcut key is disabled by default)

Ubuntu 13.04 mini-iso with Gnome desktop/shell 3.8 installed, C-Alt-Del brings up a confirmation dialogue asking if I want to log out. GDM appears to be the DM.

Ditto here on Unity, but I got a confirm dialog. On Windows it's still the software interrupt, and on the corporate edition of win7 at work I get "Press Ctrl-Alt-Del to log in" on every boot.

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