C-a dC-a C-ddetach [-h]
Detach the screen session (disconnect it from the terminal and put it
into the background). This returns you to the shell where you invoked
screen. A detached screen can be resumed by invoking screen
with the -r option (see also section Command-Line Options).
The -h option tells screen to immediately close the connection to
the terminal (“hangup”).
None yet.