Program switch – Which is “Program 1” and “Program 2”? How is it defined?

Hi,

Maybe it is a dumb question, but I can’t find the answer.

I would like to use one program switch input on my OS3 AC running 2.1.9.
I found the setting and the section of the manual.
But it is told nowhere, how do I know, which program is “Program 1”?
Do I have to give it the name “Program 1”?
Is there a numbering? I don’t really see it on the web interface or in the Android app.

Maybe someone can shed a light.

Thanks,
Zoltán