Keyboard layout preview contains unidentified keys

what are the red keys and blue keys on the keyboard and how are the different from the black keys? What should be displayed on a button with no black key? blank?

""Dead keys" (see above) appear in red, and characters accessed using the AltGr key appear at the bottom right of the corresponding key, or in some images in blue.

A dead key or key combination does not generate a character when struck, but modifies the character generated by the key struck immediately after." -- wikipedia
http://en.wikipedia.org/wiki/Keyboard_layout
http://en.wikipedia.org/wiki/Keyboard_layout#Dead_key

So to make a "ê" I type the "^" key followed by the "e" key.

Pressing the "^" key alone don't makes anything, if space is used after it output "^"

About those keys without black letter, on Thinkpads, the "^" key has two "^" symbol because pressing the key followed by the "e" key or pressing the "^" key while holding the shift button followed by the "e" key makes "ê"

For the "¸]" key, I think the "¸" should be shown as default because it don't need the shift key.

For the "`{" key, it's the same as the "^" key, the default should be "`" and it is in double on the Thinkpad keyboard.

Also note that they are 3 key between the "Enter" key and the "L" key, and the "Enter" key takes 2 rows.

If you want more details or maybe I could get pictures tomorrow don't hesitate, it's a pleasure to help.

thanks