
Usage of DisplayToggle:

1. Run DisplayToggle without options, it will return the currently display status. Return 0 for no display, return 1 for internal display only, return 2 for external display and return 3 for dual display.

2. Run DisplayToggle with option Toggle (like $/usr/bin/dcs/DisplayToggle Toggle), it will toggle display with order internal -> external -> dual -> internal  And it will return the new status.

3. Run DisplayToggle with option Internal, it will switch display to internal only. And it will return the new status.

4. Run DisplayToggle with option External, it will switch display to external only. And it will return the new status.

5. Run DisplayToggle with option Dual, it will switch display to dual mode. And it will return the new status.