How to use mouse for both windows 7 and XP at same time in virtual box

use same mouse for both windows 7 and XP at same time in VB

here windows 7 is host and XP in guest os

Open virtual box and click on guest os XP

Click on Devices and select install Guest Additions.. and it will let you to install wizard. Click next to install Guest Additions

Note:-
* If you can`t find Devices press HOST + C
* Default HOST key is right Ctrl