Dell Studio 1749 (Early 2010) - Manual (Page 51)

Monitors and Displays
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5 In the Display Settings window, move the Resolution slider bar to the left
or right to select a screen resolution that matches the native resolution of
the external LCD monitor.
6 Click OK.
Windows
®
XP
1 Right-click an open area of the desktop.
2 Click Properties. The Display Properties window appears.
3 Select the Settings tab.
4 Select the external LCD monitor in the Display drop-down menu.
5 Under the Screen resolution section, move the slide bar to the left or right
to select a screen resolution that matches the native resolution of the
external LCD monitor.
6 Click OK.
Setting the Display for Multiple Monitors
Multiple monitors can be setup with your computer to improve productivity
by expanding the size of your desktop. You can then work on more than one
task at a time by moving items from one monitor to another or by stretching
them across monitors.
click and drag monitor icons
to match arrangement of
monitors