The Java Access Bridge provided support for F keys and control keys used as accelerators. The key constants need to be added to AccessBridgePackages.h. Bit 8 (0 based) in the modifier field indicates and FKey has been pressed and Bit 9 indicates a control key has been pressed. In the first case the character field contains the F key pressed (1-24) and in the second case the character field contains the control key:

             case KeyEvent.VK_BACK_SPACE:
             case KeyEvent.VK_DELETE:
             case KeyEvent.VK_DOWN:
             case KeyEvent.VK_END:
             case KeyEvent.VK_HOME:
             case KeyEvent.VK_INSERT:
             case KeyEvent.VK_KP_DOWN:
             case KeyEvent.VK_KP_LEFT:
             case KeyEvent.VK_KP_RIGHT:
             case KeyEvent.VK_KP_UP:
             case KeyEvent.VK_LEFT:
             case KeyEvent.VK_PAGE_DOWN:
             case KeyEvent.VK_PAGE_UP:
             case KeyEvent.VK_RIGHT:
             case KeyEvent.VK_UP:

Those constants are from
http://docs.oracle.com/javase/7/docs/api/constant-values.html#java.awt.event.KeyEvent.CHAR_UNDEFINED

Suggested names of the modifier bits are ACCERSSIBLE_FKEY_KEYSTROKE and ACCESSIBLE_CONTROLKEY_KEYSTROKE.