Viewing programs side by side

Need to see two programs side by side? Hold the Windows Logo key and press left arrow to move the active window to the left half of the screen. Select another window and use Windows Logo key + right arrow to move it to the right half (works in Windows 7 onwards). Windows 10 shows small images of other open windows when you position the first window; just click the one you want to position it at the other side. Windows 10 also uses Windows Logo + up arrow or Windows Logo + down arrow to arrange up to four windows in the four corners.