Andriod M Includes A Hidden Multi Window Feature. Here Is How To Enable It.

[DroidModderX]

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When Android M was announced earlier in the week at Google I/O one of the biggest features was omitted. I am guessing its because it wasn't deemed "ready for primetime". The feature is disabled in the Developer Preview, but can be enabled pretty easily. Once enabled it is slightly buggy, but 100% usable. Here is How you Enable the feature.

1. Power down your device. Press and hold "volume down+ power" until the bootloader screen appears.
2. Plug the phone into your PC with micro usb cable
3. Download AndroidMPreviewMultiWindow.zip
4. Unzip the file to your desktop
5. Open the command prompt and type the series of commands according to your device pressing enter after each line

Nexus 5:
cd Desktop
cd AndroidMPreviewMultiWindow
fastboot flash recovery twrp-2.8.6.1-hammerhead.img

Nexus 6:
cd Desktop
cd AndroidMPreviewMultiWindow
fastboot flash recovery twrp-2.8.6.0-shamu.img
Nexus 9:
cd Desktop
cd AndroidMPreviewMultiWindow
fastboot flash recovery twrp-2.8.6.0-flounder.img

6. Now on your device press volume down until you see "Recovery Mode" Press the power button to select it. (you will now enter twrp mode)
7. Select "Mount" > check mark "System" and then press the home button. Remember to still keep your phone plugged into your computer.
8. Go back to the open command window and type the command following with an enter

adb pull /system/build.prop

9. Open the folder you extracted in step 4 called AndroidMPreviewMultiWindow
10. In the extracted folder you will find a file called "build.prop" Open this with a text editor
11. Find the line "ro.build.type=user" and change it to "ro.build.type=userdebug". Now save the file
12. Go back to the command prompt and type the following commands pressing enter at the end of each line

adb push build.prop /system/
adb shell
cd system
chmod 644 build.prop

13. Now go back to your device and select "Reboot" > "System". If TWRP asks you to install SuperSU select "Do Not Install".
14. Enjoy MultiWindow on Android M!

There are also directions for Mac and Linux at the link below. The process is mainly the same with a few variations in the commands used.

via AndroidRootz.com