Thanks for all the responses. I obviously didn't express myself clearly: I know what the buttons do; I wanted to know why they look different to those on images in Nexus for Dummies.
@Teknikal - thanks again - it's running Android 5.1, so that might be the reason. I've had a quick look at the Android Questions site, and it looks good.
@Eowyn - thanks, but I've lost nearly all my French since I came back from Canada in 2000. Is there a way of downloading the manual?
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