Summary
To type Umlauts on a PC or Mac, you need to press and hold the Option (or Alt) key while typing the letter u, followed by the letter you want the Umlaut over (a, o or u). On a Mac, this requires two keystrokes: Option-u, then a = ä.
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On Windows, you need to press and hold the Alt key while typing the character’s alt code on the numeric keypad. The alt code for Umlaut o is 0246.
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According to
