I have a very high resolution monitor and would prefer it if Windows saw it as 2 (or more) separate monitors so that Windows Explorer can behave as if multiple monitors are in use.
Do you mean show two windows open side by side on your monitor? If so, there are several ways to do it. One, you can left click on the top of a window and, while holding down the button, drag the window to the left or right side of the screen. Open another window and do the same thing to it, only drag it to the other side of the monitor.
You can also do the same with the keyboard. Click on a window anywhere, then, while holding down the windows key, press the right or left arrow key. do the same with the other window, only press the opposite arrow key.
A software solution that offers far more flexibility is Divvy. The trial version can be used indefinitely for free. When you click on the Divvy icon in the tray, it will put a grid onto the screen. You just highlight the cells in the grid where you want the window to resize and move to, then the last active window will resize and move itself on the screen where you highlighted. You can do multiple windows this way. It also works with multiple monitors by putting a grid on each monitor.
Samsung 128GB 840 Pro SSD (1),
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PSU
Corsair HX750w
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Antec Two Hundred v2 (modified)
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Cooler Master GeminII S524 120mm (fan replaced with a 140mm)