New Perspectives on Computer Concepts 2013: Comprehensive 15th Edition by June Jamrich Parsons,Dan Oja

تمرين 53

While using several Windows programs at the same time, your computer displays an error message that refers to a program that is not responding. You recognize this message as one that might result from a(n) leak and decide to close the non-responding program using the Ctrl, Shift, and Esc key combination.