I'm trying out Airprint in 4.2, and I'm confused. 1) I can only see the 'Print' option in Photos, Mail and Safari, so how do we print files in iDisk, Dropbox, Docs2Go, etc.? 2) when I try to print to a printer connected to my PC, it is seen OK, but when I select it, I get a prompt that says 'Password required for Epson.... @ Iain-PC'! Evey username and password combo I know just fails. I have no idea about passwords on printers. Any ideas?