on the pc (vista) i just have the option to switch to the american english keyboard (and back to the british keyboard when i want to use that) means when it is on AE all i have to do it hold altgr and type the letter and it gives me the accent also the ñ and the upside down ¡, haven't figure out the ¿ tho.. or the ¨ but they'll be there somewhere...
on a mac it's easy enough:
alt+e then type the letter gives you the accent,
alt+n then type n gives you the ñ,
shift+alt+? gives you the ¿
and alt+1 give you the ¡,
alt+u follow by any letter gives you the 2 dots ü
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