-M Places the ssh client into “master” mode for connection shar‐
ing. Multiple -M options places ssh into “master” mode but
with confirmation required using ssh-askpass(1) before each op‐
eration that changes the multiplexing state (e.g. opening a new
session). Refer to the description of ControlMaster in
ssh_config(5) for details.
The only reason I ever use screen is for persistence, the multi-windows is just a secondary feature.
Do you think they only got one person to do it or something?
If they weren't looking at multiple options then ... why did they still ask SJ?
Oh right because they asked SJ because they hadn't picked yet.