How does grub2 know what to boot?

[Tom Horsley]

On Mon, 10 Jun 2013 17:46:21 +0300
Cristian Sava wrote:

> Sometime back I had a similar problem and I discovered that my old grub
> install (other partition) was used. Do you mind to check?

I don't have an actual problem. It is definitely using the
new install to boot from because it offers the new f19
install as a boot option, I'm just curious how it works :-).