Moving the pointer without a mouse

When ever the mouse of computer is out of order, then we face a big problem. Sometimes we cannot wait till replacement of mouse, then we have some other options. The simple way to choose an option from the screen is TAB button. But along with that we have an other option, using that we can move the pointer without a mouse. 

Here is process :-
Step 1: Press Left Alt+ Left Shift+ Num Lock Button
           Then we get a dialogue box on the screen.

 

Screenshot : windows 7

Step 2: Now click OK there.
Step 3: Now with the help of Numeric keys we can replace the mouse. (Press and Hold)
              7 8 9
               4 6
              1 2 3
 And to select anything, simply press 5

NOTE:  To switch back to previous stage, follow step 1 and click NO 

Screenshot : windows XP (Settings)