Caroline Rey Jan 04
For Mac users :
System Preferences -> Displays -> Arrangement.

For Windows users :
Windows 7 : Start -> Control Panel -> Appearance and Personalization -> Display -> Adjust screen resolution. Select display number 2 and then "Extend these displays".


Windows XP : Start -> Control Panel -> Display -> Settings. Select display number 2 and then click on "Extend my Windows Desktop onto this monitor"