What the Secret in Nokia N9000 Button?

Do you know if there is a secret in the button of Nokia N900.You can
try this for your Nokia N900.

Public Button :

* Ctrl + Backspace: Turning to the previous tab
* Ctrl + C: Copy text
* Ctrl + V: Paste text
* Ctrl + X: Cut text
* Ctrl + A: Select all
* Ctrl + O: Open (if possible)
* Ctrl + N: Create a new item (if possible)
* Ctrl + S: Save (if possible)
* Ctrl + Z: Undo (if possible)
* Ctrl + Y: redo (if possible)
* Ctrl + F: Opens the search bar (if possible)
* Ctrl + Arrow Right: Pointer directly to the end of the sentence
* Ctrl + Left Arrow: Direct Pointer to the beginning of the sentence

Web Browser button:

* Ctrl + N: Opens a new window
* Ctrl + R: Reload
* Ctrl + B: Open bookmarks
* Ctrl + D: Adding bookmarks

Email / SMS:

* Ctrl + Enter: Send a message / email
* Ctrl + R: Reply to message / email

RSS Reader:

* Ctrl + R: Refreshing feeds

Screenshots:

* Ctrl + Shift + P: Capture display screen