Which device of computer operation dispenses with the use of the keyboard?

ANS:C - Mouse

How to control mouse using keyboard in Windows 7/8/8.1 PC :

1. Open Control Panel.

2. Navigate to Ease of Access Center. Scroll down, click on "Make the keyboard easier to use".

3. Under "Control the mouse with the keyboard" section, turn on "Turn on Mouse Keys". Then, click on "Set up mouse keys".

4. Again, turn on "Set up mouse keys" in the new dialog box.
5. Enable the keyboard shortcut, "ALT + LEFT SHIFT + Num Lock".

6. Set "Top Speed" and "Acceleration" to high.
Done.

Next, open "Mouse" in "Control Panel".
Under "Pointer Options", set the pointer speed to "Fast". This will allow you to move the mouse pointer very easily.

Now, you are done!

Now, how to move the mouse pointer?

Do you notice arrow marks on 2, 4, 6, 8 keys in the numpad?

They allow you to move the mouse pointer in the desired direction. 5 acts as a left mouse click. 3 acts as a right mouse click.