The 3270 Function Overstrike Sequence allows a non-ASCII
character in the EBCDIC character set, such as è, to be entered from
the keyboard.
Overstrike causes the emulation to enter overstrike mode,
after which two ANSI characters, such as e and `, are typed to represent
the character. If the two characters represent a valid combination,
the resulting EBCDIC character is entered into the device buffer.
An uncompleted overstrike can be canceled with the Reset key.