When you finish using a program, you should exit (or quit or close) it to get it out of your way and to let Windows reclaim its memory for other use.
To exit a program:
Choose File > Exit (Figure 6.13 ).
or
Press Alt+F4.
or
Click the program's Close button (
or
Double-click its control-menu icon (at the left end of the title bar).
or
Right-click its taskbar button; then click Close.
or
Activate the program's window; press Alt+spacebar; then press C.