The Mouse and the Cursor
Windows reflects the movement of the mouse by moving the cursor on the screen
accordingly. As the cursor moves over different parts of windows or into
different windows, Windows (or an application) changes the appearance of the cursor.
For example, when the cursor crosses a window border, Windows changes the
cursor into a two-headed arrow.
If the system does not have a mouse, Windows displays and moves the cursor
only when the user chooses certain system commands, such as those used to size or
move a window. To provide the user with a method of displaying and moving the
cursor when a mouse isn't available, an application can use the cursor functions
to simulate mouse movement. Given this simulation capability, the user can use
the arrow keys to move the cursor.
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