Snap feature of Windows 7
Snap is a Windows 7 feature, which arranges the windows by dragging. In this article I will describe the snap feature in details.
Windows 7 Offers a Feature named Snap, by which the users can place the Windows by Dragging and arrange them side by Side.
SNAP Allows Windows 7 Users to Arrange two Windows Side by Side, by Dragging to the Corner of the Screen , Thus Two or More open windows at a Given time can be Re-sized.
How to Arrange Windows Side by Side Using Snap :
Drag the Title bar to the side of the Window , And Release the Mouse .
If you want to expand it back just Release the mouse .
How to Expand Windows Vertically by using Snap :
At the edge of the Window, Point the Mouse till Double-Headed Arrow Appears.
Now Drag the Edge up or Down to Expand the Windows Vertically
Reference: http://www.microsoft.com/windows/windows-7/features/snap.aspx