http://git.j8810kkw.i2p/j8810kkw/br5_p/blame/commit/ce12b38abef0417ffd620cfaee329e8e121eadd7/LICENSE
Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary.