New answers tagged shutdown
Yes, If you rename or remove C:\Windows\WinSxS\pending.xml file, you could postpone update to next reboot. I advice renaming it. It may require changing the permissions and ownership of the file. I haven't tested it on running windows image, but I am sure it works when you interrupt windows boot. Boot into recovery mode or from windows installation disc ...
No. You either do a hard shut down by killing the power to the device (pull the plug or hold down the power button) and risk corrupting the OS, or you can wait for it to finish, but there is no way to interact with the OS once it's started the process of shutting down and applying updates.
I use the following command in a batch file, which is then issued to each selected machine as a Scheduled Task by my deployment solution: for /f %%i IN ('quser ^| find /c /i "active"') DO (if %%i EQU 0 shutdown /s)
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