I don't think you can exactly do what you are asking for. One way (which
is a little cumbersome) is to use an on screen keyboard in Spanish to
type the letters you want. That keyboard is in All Programs >
Accessories > Ease of Use. Plus there is another, pretty cumbersome way
too, to type the special letters with an English keyboard as described
here:
http://www.word2word.com/key.html
'International Characters'
(
http://ml.hss.cmu.edu/mlrc/links/keyboardhelp.html)
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whs