About Dutch letters
Dutch uses the diaeresis to separate vowels (ideeën) and the acute for emphasis (één). The ij is written as two letters on keyboards, though a ligature exists in Unicode.
Most Dutch speakers use the US-International layout, where " then e gives ë and ' then e gives é.
On a Mac, Option+U then the vowel gives the diaeresis.
Dutch letters: names and codes
Every special letter in Dutch, with the Windows Alt code where one exists, the hex code to type in Word followed by Alt+X, the Mac shortcut and the HTML entity. Click a letter to copy it.