Apologies, I'm a PC user who has just moved over to Mac, and have a quick question. On a PC I can right click a photo and make it my background/wallpaper, is there a similar function on the Mac? Thanks very much, I'm happy to of made the switch, but am having trouble with a couple of things. While I'm at it, you know how you can hold down control on a PC and select multiple things, is there a similar function on a Mac keyboard? I bought a 12" pb, by the way.