The blue keys on your keyboard appear to be part of the French Canadian character set. Since HP p/n 697737-DB1 is US/French Canadian keyboard, this would tend to make sense. As I don't use or have an HP French Canadian keyboard, I can't tell you how to use the special characters. I can, however, point you to this HP forum thread entitled "Keyboard dumb question" that may be of some assistance. You can also look through the posts returned by this HP forum search for "blue keys".
Please send KUDOs