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In order for this input method to work, you must use fonts that contain the characters necessary for Hungarian, Indic transliteration or Pinyin. For example, most common fonts contain the vowels with macron (e.g. ā, ō), but the number of fonts that include the n with a dot below (ṇ) are few. Generally, a font will support certain code pages of Unicode, but not all.
As of Windows 7, it is generally not necessary to worry about your fonts. Most of the more common fonts on Windows 7 will support most of the characters you can type with this keyboard.
To understand this fully, it helps to know which characters are part of which code pages in Unicode. Below is a short list of the code pages needed to use the diacritics supported by this keyboard, and the characters that below to each.
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