I plugged the i-opener keyboard into a Windows machine to figure out what all the special keys were. Here's what I found out.
Top row of keys (Back to Hang Up) appear to be F1 - F11. I only tested F1, F3, and F4, and F10, but I assume the rest are correct.
Far right column of keys:
Home = I have no clue - maybe F12?
Help = Home
Delete = Delete
Page Up = Page Up
Page Down = Page Down
Special keys on bottom row:
Blank key = Not sure what it's called but on my Windows keyboard it has picture of a pulldown menu and a cursor on it. It seems to do the same thing as a single right-click of the mouse.
Pizza = The Windows key
Prev Ch = Insert
Next Ch = End