Depending on the keyboard layout, which differs amongst countries, it is more or less easy to enter letters with diacritics on computers and typewriters.Some have their own keys; some are created by first pressing the key with the diacritic mark followed by the letter to place it on.This has led to fears internationally that the marks and accents may be made obsolete to facilitate the worldwide exchange of data.
French treats letters with diacritical marks the same as the underlying letter for purposes of ordering and dictionaries.
Diacritic is primarily an adjective, though sometimes used as a noun, whereas diacritical is only ever an adjective.
Some diacritical marks, such as the acute ( ´ ) and grave ( ` ), are often called accents.
This varies from language to language, and may vary from case to case within a language.
In some cases, letters are used as "in-line diacritics", with the same function as ancillary glyphs, in that they modify the sound of the letter preceding them, as in the case of the "h" in the English pronunciation of "sh" and "th".