Re: F+1+2?
"do you see a button that specifically says 'F12'?"
Slight snag with that. Laptop one: simply keying F1 - F12 gets the functions, holding down the fn key at the same time gets the hardware controls - brighter, dimmer etc. Laptop two: yup, you guessed it - the other way round. How do you know what the user has unless you're very familiar with the particular model.