15  14  13  12  11  10   9   8   7   6   5   4   3   2   1   0
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
|   :   :   :   |   :   :   |   |   :   :   :   :   :   :   :   |
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
  |   |   |   |               |   \---------character---------/
  |   |   |   |               +--------function/editing key
  |   |   |   +---- Ctrl
  |   |   +-------- Shift
  |   +------------ Alt
  +---------------- GUI
b11? coming from a soft key?

16  LeftCtrl
17  LeftShift
18  LeftAlt
19  LeftGUI
20  RightCtrl
21  RightShift
22  RightAlt
23  RightGUI

b24-b31: physical key pressed

(key% AND &11FF)=&100D - Ctrl-M
(key% AND &11FF)=&000D - Return
(key% AND &01FF)=&000D - Ctrl-M or Return