$my_keys defines the menu. Pretty basic, but a couple notes:
- Some button description include newlines. The text doesn't wrap automatically and weird stuff can happen if you don't break long strings. Exact weirdness is browser dependent
- The second argument can be any POS input including the command for a different menu like "QK3" here. This is how you build nested menus.
<?php
$my_keys = array(
);
?>