>> it was specified in Apple’s overview of the new OS (scroll down to “Multitasking”).
OF COURSE! Scroll down to multitasking! (slaps forehead).
THAT is certainly intuitive to one who has never seen the device before! :-)
Seriously, if you don’t bother to take the time to read a brief summary of the features, then you shouldn’t be complaining that you don’t know how to use the features. I mean, I’m personally a big fan of “if all else fails, read the manual”, but I still do have “read the manual” in there.