Very simple question is how, to determine the coordinates of a point on a computer monitor screen running Mac OS X without the help of third-party programs? You will be surprised at how simple the answer is.
In order to find the coordinates of the point on the screen, we will use a function that is only available to Mac OS X users. It is a SNAPSHOT of the screen. You just need to press the key combination Shift + Command + 4. A special cursor will appear on the screen. Now You can see the X and Y coordinates of the point.
When you know the coordinates of the point, just press Esc to quit from snapshot mode.