1. Click Start
, and then click Control Panel
2. Click Appearance and Themes
, and then click Display
3. On the Settings
tab of the Display Properties dialog box, click the monitor icon that represents the monitor you want to designate as the primary monitor.
4. Click to select the Use this device as the primary monitor
check box. Note that this check box is unavailable when you select the monitor icon that is currently set as your primary monitor.
These instructions are for XP (found/abridged from here: http://support.microsoft.com/kb/307873
), but for other windows operating systems it should be similar.
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