Apple, in their minimalistic world, optimized the back-slash ‘\’ away on their keyboards (along with delete and other ‘useless’ keys), so using their keyboords for anything else than writing blogs is a pain when you don’t know where the ‘other’ signs are hidden.
\ (backslash) = shift + alt + 7
| (pipe) = ctrl + alt + “´`” key
This is only for danish keyboards.
I guess this is one of those cases where apple’s designers have forgotten that functionality comes before design. Same thing with the ‘one-mouse-button’ blunder, last time I checked, humans still had 5 fingers on each hand.