Open submenus when I pause on them with the mouse pointer. What is this?

In Windows Vista, when you click on the Start button and hover the mouse over All Programs or over the expandable items then after a short time, the sub menus gets displayed. This is a feature that is enabled by default in Windows Vista. You can also turn it off or on. To turn off this feature, perform the following steps:

1. Click Start button , click Control Panel.
2. Click Appearance and Personalization.

3. Click Taskbar and Start Menu to open Taskbar and Start Menu Properties dialog box.

4. Click on the Start Menu tab and then click on Customize...

5. From the Customize Start Menu dialog box, under You can customize how links, icons, and menus look and behave on the Start menu, click to remove the check mark from the Open submenus when I pause on them with the mouse pointer.
6. Click OK to close the Customize Start Menu dialog box.
7.Click OK again to close the Taskbar and Start Menu Properties box.

To turn on the “Open submenus when I pause on them with the mouse pointer” feature, perform the first four steps as provided above and then from the Customize Start Menu dialog box, under You can customize how links, icons, and menus look and behave on the Start menu, click to place the check mark to the Open submenus when I pause on them with the mouse pointer. Click OK to close the Customize Start Menu dialog box. Click OK again to close the Taskbar and Start Menu Properties box.