Do notifications of conference papers' acceptance/rejection sent to all the papers' authors at the same time? I have two inquiries, please.

Suppose that authors X, Y, and Z submit 3 different papers to the same conference. Will they all get notifications of acceptance/rejection at the same time (or a short period of time) or not necessarily?
Is it possible to get a notification of paper acceptance/rejection before the notification deadline?
In my field (software engineering):


Suppose that authors X, Y, and Z submit 3 different papers to the same conference. Will they all get notifications of acceptance/rejection at the same time (or a short period of time) or not necessarily?


By and large, for most conferences, yes. But there are exceptions: For a conference with separate thematic tracks, it might happen that the tracks send the notifications at separate times. I have also seen very few individual cases of conferences where individual notifications were sent late, which made a poor impression on me (something that very good conferences want to avoid).

2- Is it possible to get a notification of paper acceptance/rejection before the notification deadline?

Absolutely, yes. From my experience, this is actually more common for top conferences than for other conferences.