How to control windows 7 & 8 snap feature with multiple monitor

Have you tried to snap your opened document to the left/right of your screen but it opened up in full? You might face this problem if you have multiple monitor with extended display. 

What you can do is press "Windows Key" + "Left arrow/Right arrow" to snap the selected window to left or right. By continuing pressing the "Left arrow/Right arrow" while holding down  "Windows Key", you can snap the selected window to your other monitor.