To enter an accented character, type Control-accent, followed by the character, so for á, type Control-' and then a.
This will be most useful to Windows users with English keyboards, but it should work for any OS and keyboard.
The complete list of accents is:
' gives acute (Ó)
` gives grave (Ò)
: gives trema (umlaut/diaeresis) (Ö)
^ or > gives circumflex (Ô)
, gives cedilla (Ç)
~ gives diacritic tilde (eñe) (Ñ)
" gives double acute accent (Ő)
* gives ring above (Å) and some special characters like ¿ and €.
\ gives greek letters (ε)
For more information, go to the support web page.