This class is thrown as an exception if UtCGIKey does not recognize the key.
This class has no ancestors.
This class has no requirements.
This class has no protected members.
This class provides no new static methods.
This class provides no new overrides.
This class provides no new virtual functions.
stores the unrecognized keyword.
This method constructs an UnknownKey object.
This method returns the unrecognized keyword which caused the exception to be thrown.