Although you will often see the accent left off a capital letter - it is deemed to be a good idea to use it, so that you can demonstrate that you know it should be there! Hold down the "Alt" key whilst pressing the numbers on the numbers keypad

Lower case
Upper case
à = Alt 133
À
= Alt 0192
â
= Alt 131
Â
= Alt 0194
ä
= Alt 132
Ä
= Alt 142
æ
= Alt 145
Æ
= Alt 146
ç
= Alt 135
Ç
= Alt 128
è
= Alt 138
È
= Alt 0200
é
= Alt 130
É
= Alt 144
ê
= Alt 136
Ê
= Alt 0202
ë
= Alt 137
Ë
= Alt 0203
î
= Alt 140
Î
= Alt 0206
ï
= Alt 139
Ï
= Alt 0207
ô
= Alt 147
Ô
= Alt 0212
œ
= Alt 0156
Œ
= Alt 0140
ù
= Alt 151
Ù
= Alt 0217
û
= Alt 150
Û
= Alt 0219
ü
= Alt 129
Ü
= Alt 154