Does anyone know what really happens when one attempts to edit a file in the
background using "vi" and &
At the shell, I typed
% vi filename &
And I got
%  450
And then, I am at the shell again.
I know the 450 is the process id number. What is the  for?
With the ps -e command, I know the process is still alive in the background.
Is it possible to even access the vi editor in the background, let's say, to
edit the filename? If you know, please explain why or why not. Thanx.