The Seika3 Braille Display has 8 keys: 

 Top of display (next to braille cells):
  - Left Button
  - Right Button

 Front of display:
  - Left Ctrl Left
  - Left Ctrl Right
  - Left Shift
  - Right Shift
  - Right Ctrl Left
  - Right Ctrl Right


 
The functions are defined as below: 

Action                               Key press

Action Open Control Panel            Left Button + Right Button
Braille Back                         Right Ctrl Right
Braille Forward                      Right Ctrl Left
Braille Line up                      Left Ctrl Left
Braille Line down                    Left Ctrl Right
Braille Go To Focus                  Left Shift
Braille Line Start                   Left Button + Right Ctrl Right
Braille Line End                     Left Button + Right Ctrl Left
Braille Top                          Left Ctrl Left + Right Ctrl Right
Braille Bottom                       Left Ctrl Right + Right Ctrl Left
Braille Cell Left                    Right Ctrl Right + Right Button
Braille Cell Right                   Right Ctrl Left + Right Button
Braille Physical/Logical Mode        Left button + Left Ctrl Left
Braille Literary Braille on off      Left Button + Left Shift
Braille Cycle Attributes             Left Ctrl Left + Right Button
Braille Describe Character on off    Left Shift + Right Button
Braille On Off                       Left Button + Left Ctrl Right
Braille Monitor on off               Left Ctrl Right + Right Ctrl Right
Braille Hooks on off                 Left Button + Right Shift
Braille tracking on off              Right Shift
Braille Enhance on off               Left Ctrl Right + Right Button
Custom Global Speak Time and Date    Right Ctrl Left + Right Ctrl Right
Simulate Key Press Up                Left Ctrl Left + Left Shift
Simulate Key Press Down              Left Ctrl Right + Left Shift
Simulate Key Press Left              Left Shift + Right Ctrl Left
Simulate Key Press Right             Left Shift + Right Ctrl Right
Simulate Key Press Enter             Left Ctrl Right + Right Shift
Simulate Key Press Tab               Right Button
Simulate Key Press Shift Tab         Left Button
Simulate Key Press Escape            Left Ctrl Left + Right Shift
Simulate Key Press Windows           Right Shift + Right Ctrl Left
Simulate Key Press Alt               Right Shift + Right Ctrl Right
Speak Keys Where am I?               Left Shift + Right Shift
Text Input Enter                     Left Ctrl Right + Right Shift
Virtual Focus Move Physical Up       Left Ctrl Left
Virtual Focus Move Physical Down     Left Ctrl Right
Virtual Focus Physical on off        Left button + Left Ctrl Left
Virtual Focus Previous Line          Left Ctrl Left + Left Shift
Virtual Focus Next Line              Left Ctrl Right + Left Shift
Virtual Focus Interact with control  Left Ctrl Right + Right Shift
Virtual Focus Next Object            Right Button
Virtual Focus Previous Object        Left Button

