If you want to control your mouse pointer with the keyboard, Windows XP and Windows 7 provide a way:

Press Alt + Left Shift + Num Lock keys all at once and a prompt will appear telling you that you have activated mousekeys, select ok then you can control the mouse with the numpad.

The controls are:

• 1,2,3,4,6,7,8,9: move the mouse
• 5: mouse button click
• +: double click
• Insert: hold down mouse button
• Delete: release mouse button (after holding it down with insert)
• /, * or -: select which mouse button the above controls will click (left, both or right respectively)
• Num Lock: disable mousekeys.