Understanding the "External Editor opens each File in a Separate Window (Process)" Setting

Hi all

If you go to the General Preferences (Tools -> Preferences...),
then select the "Editors" page,
then Edit the "Notepad" item,
you will see there that the setting
"External Editor opens each File in a Separate Window (Process)" is set to False.

Why is that?

After all, Notepad is not a tabbed Editor, it cannot edit more than one file in one program instance,
and therefore must create a new Process per each File opened.

What is the difference If we change that setting to True instead of False - here for Notepad?


Thank you