Adding new SQL keywords

Hello,
        I'm working on the 4.1 source (on WinXP) and I would like to add new 
keywords for the lexer and parser. Specifically, I would like to add some 
HANDLER-related keywords. How do I go about it? I have looked through 
sql_yacc.cpp, but it seems that there is something else that I need to do. 
Thanks in advance.
 
Regards,
            Mark.