What key combination could have caused this to happen?

[Pradeep1210]

While I was having a fight with my 2 year kid today, he pressed some key combination on the keyboard that launched my webbrowser looking for the url: http://www.c.com/TEMP.com

This left me wondering what key combination/sequence that might have been?

I know I have a C drive and a folder named TEMP in C drive. That's the only clue I have looking at the url.