Hold the Alt key down and type in the indicated number (then release Alt) to produce the following accents:
(This does not seem to be working on laptops without the extended keyboard.  If you have an extended keyboard with Number Lock, make sure it is on.)
 
À 0192     à 0224         È 0200     è 138            Ì 0204     ì 141
Á 0193     á 0225         É 144       é 130            Í 0205     í 161
 0194     â 131           Ê 0202     ê 136            Î 0206     î 140
Ä 0196     ä 132           Ë 0203     ë 137            Ï 0207     ï 139
 
Ò 0210     ò 149            Ù 0217     ù 151
Ó 0211     ó 162            Ú 0218     ú 163
Ô 0212     ô 147            Û 0219     û 150
Ö 153       ö 148            Ü 154       ü 129
 
 
Ç 128      ç 135            Œ 0140     œ 0156
 
« 174      » 175
 
Ñ 165      ñ 164            ¿ 168