^ Index Name ^ Description ^
| Main or 0 | the screen with the primary menu bar (as configured in the Displays preferences).|
| Second | the first from the left which is not the _Main_ screen.|
| Third | the second from the left which is not the _Main_ screen.|
| Internal | the internal screen of the Mac.|
| External | the first from the left which is not an internal screen.|
| Mouse | the screen containing the mouse.|
| Front | the screen containing (the most of) the front window.|
| Back | the first from the left not containing (the most of) the front window.|
| Back2 | the second left most screen not containing (the most of) the front window.|
| All | all of the screens, from left to right, one per line. |
| Positive Calculation | the indexed screen from left to right. |
| Negative Calculation | the indexed screen from right to left. |