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9.
Ctrl is the Control key.
Alt is the Alt key.
Del is the delete key. (For Mac users who don't have a backspace key, it's the one under the help key, or below the F13-15 keys).

Control Alt Delete was created by Microsoft to make sure that you weren't sending your user name and password to a website. It was also created to fix crashed applications and force-reboot your computer. They had to do this, probably, because nothing worked.

Ctrl-Alt-Del can never be used by a website to enter your password, exactly Microsoft's point. If you send your password to another website, they can eventually hack into your computer and delete/add/make virus files. Not good.

Fortunately for Mac users, Ctrl-Alt-Delete is not required, mainly because 1. There are two Delete keys, and 2. There is no alt key. (Actually, there is an alt key, but it is in the option key too, so technically it is not the Alt key.) Also, the Macintosh is almost imposible to hack thanks to its Unix structure and secure operating system
Press Ctrl+Alt+Del to begin.
Pushing Ctrl+Alt+Del again will reboot your computer, losing all of your unsaved data.
by ianweller December 05, 2004
 
1.
The keys u press when ur shitty windows computer fucks up and u need to restart.
My shitty windows computer fucked up fo the 5th time in 10 min.
by cartman5000 July 26, 2004
 
2.
A heavily over-rated webcomic. It used to be quite funny, but it lost it, it is now plagued by long winded story arcs, overexplained jokes and overly repetetive Copy-Pasted art. The comic however still seems the most popular on the web, most probably due to the relentless fanboys who foam at the mouth when you have the slightest critisizm for the damn comic. The forums are run by those fanboys so you can expect the results.
ctrl+alt+del was funny at first, but I don't know why people still read it, it's boring :/
by Gewdahs January 12, 2008
 
3.
The only way to fix Windows... Used to reset the computer and/or end programms running.
AHHHHH BLUE SCREEN OF DEATH!! must press Ctrl+Alt+Del to save it!
by Fury1671 November 08, 2003
 
4.
1. A combination of keys used in most Windows operating system to open the task manager, most notably used for closing programs which are for some reason difficult otherwise. Has other features that no one ever uses though.

2. A gaming webcomic created by Tim Buckley often with associated other webcomics such as 8-Bit Theater, Penny Arcade, and VG Cats. However, many consider it to be inferior to the forementioned webcomics due to the fact that it often steals jokes and ideas from them. It is also considered to be a lot more commercialistic than the others. Overall, it isn't too bad though.
1. After attempting to run Windows Media Player, Battlefield 2, Doom 3, and Norton Antivirus all at the same time, my computer 'asploded and I had to use Ctrl+Alt+Del to to put it out of its mysery.

2. All hail Ethan, king of Winter-een-mas!
by Quizznotik May 14, 2006
 
5.
The answer to most windows problems. Or so they say.
"shit computer! why won't you work! i'm gonna ctrl+alt+del your ass!"

"argh!! there's a pop-up and i don't know what it's saying! i'll ctrl+alt+del it, that'll sort the bugger out"

(after waiting 5 hours to get to a computer help line in southern asia)
"hey, i have this problem...."
"have you tried ctrl+alt+del?"
by anon55 August 28, 2006
 
6.
1: A key combination in windows which allows you to end any task in progress. (provided that it's on your computer)

2: A webcomic featuring Penny Arcade ripoffs. Of course, the author won't admit it as "the setup is completely different".

3: A definition about to be deleted by bichty CAD fans.
Fucking computer...hit Ctrl+Alt+Del!
by ajfoiejo November 15, 2003
 
7.
When a single program, or Windows grenades, press these in combination to send it to hell!
"BSOD! FUCK...I'm pressin' CTRl+ALT+DEL, and calling that moron in India for help! Damn foreign outsourcing! Damn Compaq p.o.s.
by Punkhead May 25, 2005