Keyboard Shortcut to manipulate window position

I'm looking for a 'Bring all to back' command.

In fact, I'm using Magnet and I have many superposed windows, and I would like to put the front window A to back in order to see the window B just below the window A.

Actually, I'm using Mission Control (http://imgur.com/Or1bi5e) to select the window B but I'm sure that is not the fastest way and I would like to create a Keyboard Shortcut to put the window A to back.

Any help will be much appreciated.

Edit:

I can resumed by: "How to put a window back of the screen" instead of the feature "Bring to front"

Edit 2:

Screen aspect:

[Back A B C D E F G Front]

Screen content:

• [] is screen
• A B C D E F G are windows
• A & C are from Finder
• B D F are from Safari
• E is from Notes
• G is from Reminder

Then:

1. G is active
2. Put G to back
3. Get F on front

So:

If I put successively G F E D C B A to back I will retrieve G on front

How to navigate macOS application windows like a boss

Cmd Tab : switch to the next app (icon to the right)

Cmd Tab, followed by Cmd `~ : switch to the previous app (icon to the left)

Cmd `~ : cycle through all open windows of the app in focus. (Minimized windows are skipped.)

Below is an animation demonstrating what it looks like when windows are cycled.

This is a much faster way to navigate than Mission Control. And if you use Cmd H to Hide applications you're not using, you can keep your workspace free of clutter. Hidden apps are revealed again when tabbed to.

_{This answer assumes the use of an English keyboard, where the back-tick key's shifted character is the tilde. On non-English keyboard layouts, the back-tick key may have a different shifted character.}

Precision control

For those looking for a solution similar to Magnet, but free, you can customize the AppleScript below, place it inside of an Automator Service, and trigger it with a keyboard shortcut.

tell application "System Events"
    set activeApp to name of first application process whose frontmost is true
end tell


set theApp to activeApp
(* These dimensions are for a 27-inch iMac. Customize as necessary. *)
set appWidth to 1280
set appHeight to 1440

tell application "Finder"
    set screenResolution to bounds of window of desktop
end tell

set screenWidth to item 3 of screenResolution
set screenHeight to item 4 of screenResolution

tell application theApp
    activate
    reopen
    set xAxis to (screenWidth - appWidth) / 2 as integer
    (*
    FOR LEFT PLACEMENT:   set xAxis to 0
    FOR CENTER PLACEMENT: set xAxis to (screenWidth - appWidth) / 2 as integer
    FOR RIGHT PLACEMENT:  set xAxis to (screenWidth - appWidth) as integer
    *)
    set yAxis to (screenHeight - appHeight) / 2 as integer
    set the bounds of the first window to {xAxis, yAxis, appWidth + xAxis, appHeight + yAxis}
end tell

_{Code originally written by Amit Agarwal and Tetsujin. Combined and modified by me.}

• How to create a simple keyboard macro with Automator?

_{After triggering the Service, you may see the message: "AppName.app" wants access to control "SystemEvents.app". Allowing control will provide access to documents and data in "SystemEvents.app", and to perform actions within that app.} You must click "OK" to use the Service.

macOS is not Windows!. There is no universal shortcut which sends window A to the back and window C to the front assuming window A (front) and B (back) belong to app1 and window C (front) and D (back) belong to app2 to get the window sequence C - A - B - D finally. macOS' window management always "groups" windows of the same app and you will get the following sequence C - D - A - B (in this case executing cmdtab).