This procedure applies when two or more monitors are connected to one computer.
Open Display in Control Panel.
On the Settings tab, click the monitor icon that represents the monitor you want to designate as the primary one.
Select the Use this device as the primary monitor check box.
This check box is unavailable when you select the monitor icon that is currently set as your primary monitor.
To open Display, click Start, click Control Panel, click Appearance and Themes, and then click Display.
This procedure is intended for people using multiple monitors. If you have just one monitor attached to your computer, you do not need to designate the primary monitor. Click Related Topics for information about installing multiple monitors.
The monitor that is designated as the primary monitor will display the logon dialog box when you start your computer. In addition, most programs will display windows on the primary monitor when you initially open them.