Apple Macintosh
Method: option + key [+ key]
Hold down the option key while entering the first letter of a sequence (e.g., option ` or option e).
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Release the option key and enter the second character of the sequence (e.g., a, e, i, n, o, or u): you should see the accented character.
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Exceptions: A few special characters (ç, ß, ¡) are produced by simply entering option + key. The ¿ character is produced by simultaneously entering 'opt shift ?'
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Character Table
character

Macintosh

PC

character

Macintosh

PC
à

opt ` + a

alt + 0224

ñ

opt n + n

alt + 0241
á

opt e + a

alt + 0225

ò

opt ` + o

alt + 0242
â

opt i + a

alt + 0226

ó

opt e + o

alt + 0243
ä

opt u + a

alt + 0228

ô

opt i + o

alt + 0244
ç

opt c

alt + 0231

ö

opt u + o

alt + 0245
è

opt ` + e

alt + 0232

ß

opt + s

alt + 0223
é

opt e + e

alt + 0233

ù

opt ` + u

alt + 0249
ê

opt i + e

alt + 0234

ú

opt e + u

alt + 0250
ë

opt u + e

alt + 0235

û

opt i + u

alt + 0251
ì

opt ` + i

alt + 0236

ü

opt u + u

alt + 0252
í

opt e + i

alt + 0237

¡

opt 1

alt + 0161
î

opt i + i

alt + 0238

¿

opt shift ?

alt + 0191