This command prompts the user for a digraph sequence. The next two characters typed are looked up in a builtin table and the resulting character is inserted in the input stream. For example, if the user enters ‘a"’, an a-umlaut will be inserted. If the first character entered is a 0 (zero),
screenwill treat the following characters (up to three) as an octal number instead. The optional argument preset is treated as user input, thus one can create an "umlaut" key. For example the command ‘bindkey ^K digraph '"'’ enables the user to generate an a-umlaut by typing ‘CTRL-K a’.