Complemeting the great information given by Liland:

I have a standard American keyboard (I hate the repositioning of lots of keys in so-called Spanish keyboards) and my setting is "Language= English USA" and "Layout= USA International". With these settings I have all accented Spanish vowels by pressing SINGLE QUOTE and then the vowel, example 'a = á , 'e = é , etc.

The letter ñ is ~n , and Ñ is ~N, and ü is "u (to type 'a so you see it as singlequote+a, I simply press singlequote, a space, and then the a)

French accents like è ò can be typed by pressing the grave accent (left to right) which is located left to the "1", and then the vowel.

ã õ can be gotten by ~a , ~o

Un abrazo - Andrés (in the troubled Buenos Aires)