Stop a computer from shutting down

Ever mistakenly shutdown your pc and wish you could just stop it?
it's quite easy if you can type fasts enough.
Windows gives you some time within which you can stop or abort
an unwanted shutdown.
Here's how........
1. Press the windows key and R key to open the run dialog box.
2. Next, type shutdown -a

This signals the shutdown to abort.
the - is a hyphen.

if all things go well and the "injury time" is not up, the shutdown
will be successfully aborted.
Happy tweaking.