A compose key, whether already existent on the computer keyboard or designated to an existent key, is a modifier key used to input a number of characters that are not part of the official keyboard. Upon its use, it signals to the software to interpret the following keystrokes (usually two) as a combination to produce an alternate character. For example, striking Compose, followed by ~, and then n will produce the character ñ; striking Compose, followed by O, and then C will produce the copyright symbol ©.
== Key details ==
The compose key's behavior differs from typical modifier key behavior (such...