Which Button?

Katherine sat in her favorite corner of the couch and leaned forward slightly as she watched the characters on her favorite TV program solve yet another unsolvable problem through friendship and ingenuity.  On the other side of the house, her Momma decided that the computer needed to be turned off (be it because of the energy it sucked up or the heat it put out or just because no one was using it at the moment).  “How do you turn off the computer?” she called out.  Katherine had three choices.  She could get up and turn the computer off herself (missing the amazing conclusion to the program).  Or, she could try to explain to her mother how to move the mouse and click in the appropriate places.  “Just push the button and hold it!” she shouted back, thinking to have solved the problem.  After a pause, Momma called back, “Which button?  There’s a whole keyboard full!”