Mouse. In the Mouse Properties dialog box open the Pointer Options tab and see the options in the Motion area).It is possible to increase the precision of free-hand point positioning by simply holding down the ALT key while moving the mouse around keeping the left mouse button pressed.
The movement of the cursor will be slower and will enable you to achieve a point positioning precision much higher than the ordinary one. Note that the precision you can reach with this functionality is even higher than the maximum you can set through the operating system properties (Control Panel Mouse. In the Mouse Properties dialog box open the Pointer Options tab and see the options in the Motion area).
For example, when modifying a curve by freely moving its control points using the mouse, you might need to increase the precision, which could ordinarily be affected by the hardware characteristics of the mouse itself and by the screen resolution. This feature solves the issue.