How does Windows 7 turn the onscreen keyboard on or off?

Description of the problem:
How does Windows 7 turn the on-screen keyboard on or off?

Solution:
1, open the control panel, view it as “large icon”, double click to open “Easy Access Center”, as shown below:





2, select "Start Screen Keyboard" in the pop-up window, as shown below:





3, the startup effect is as follows As shown:





4, close the screen keyboard and click "Close" in the upper right corner.





Press NumLock to switch to the keypad. Note that the 3 and 8 of the keypad are actually displayed on the screen as 1 and 4. The keypad is as follows: