- If the given string is null, any existing definition for the keycode is
- removed. Similarly, if the given keycode is negative or zero, any
- existing string for the given definition is removed.
+ If <EM>definition</EM> is <STRONG>NULL</STRONG>, any existing one for the keycode is removed.
+ Similarly, if the given keycode is negative or zero, any existing
+ string for the given definition is removed.