Q:

How can I open a specific URL every 9 hours in Windows?

I need my computer to open a specific URL every 9 hours, even when the computer is locked (Win-key + L).
How can I achieve that?  
I must add that I have zero knowledge about scripting for Windows.

A:

I wrote:
cmd /c start http://example.com 

in a BAT file and ran a scheduled task for it every 9 hours.

