Clear all: Ctrl-A
Save to file: Ctrl-S
Copy calculation line: Ctrl-C
Paste: Ctrl-V
Copy Result: Ctrl-R
Review previous calculation and result: Up navigation button
2) Stop Watch
Start/Stop: Enter
Pause: Space
Reset: Backspace
3) Countdown Timer
Start/Stop: Enter
Pause: Space
Reset: Backspace
Close: ESC key