This question already has an answer here:
In Windows 7 I can drag the title bar of a window to the left or right of the desktop and it snaps to be half the monitor width and its height. However it won't do this at a monitor edge that isn't the edge of the desktop, i.e., the right edge of the left monitor and the left edge of the right monitor. Is there a way in Windows 7 to do this? I'm aware of add-on programs such as WinSplit Revolution, but I was hoping to do this natively.