You might be running many processes and applications in Windows and you might not want to display all of them. Windows Hider is an useful freeware tool designed to hide windows, programs, files, folders (all to background, from desktop and taskbar) without closing them. You can instantly make them hidden by one click or hotkey. With Windows Hider you can divide your windows, programs, files, etc.. by groups and rename each group by its properties.
When you open the application, it lists all the current running files, folders and programs on the left hand panel. There are 4 groups available and you can add programs to the list and hide the group. You set the group name and also set the hotkeys for hiding the group.
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Windows Hider is a nice free tool to quickly hide any running application.