Rotating the mouse is not a meaningful action. This point is usually in the center of the icon or at a corner. The shape of the icon should make it easy to guess where the hot-spot is. Some interactions may be performed while dragging with more than one mouse button down at the same time. One can make a change in gray level, by dragging with all three buttons held down while moving the graph vertex.
Some actions perform a completion action only after the last mouse button is released.
For example, consider the pan window interaction. The main display window is not actually redrawn until all mouse buttons are released. The area that would appear in the main display window, if the mouse buttons were released at that point, is represented by a box drawn in the pan window. By this we mean that that which is being controlled is repeatedly updated as the mouse is moved, giving the impression of smooth, continuous change. An example of this is moving a cursor with the mouse.