What does pressing ALT F4 do ??

Question

there are images like the one here that say's press ALT F4, what does it do? will it harm my computer or anything???

http://www.myhotcomments.com/graphics/42629

**please and thank you**

Answer 1

it closes the program your looking at. so pretty much its just an annoying joke..

Answer 2

it exits out of the window you have up

like if i was just reading your post and i typed in ALT and F4 it would close out of the internet explorer

hope this helps!

Answer 3

well pressing any two buttons on your keyboard CAN NOT hurt your computer. And yes like they said, it closes your current window