basic commands for screen(1), a terminal multiplexer  
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invokation / cmdline
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screen                      : start screen with new shell window
screen vim /etc/config.file : start screen with vim session
screen -list                : list sessions

help
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^A - ?                      : show commands

window commands
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^a c                        : create new shell window and switch to it
^a "                        : show windowlist
^a <n>                      : switch to window <n>
^a \                        : quit & end all sessions
^a k                        : kill current window
^a d                        : detach screen from current window
^a r <p>                    : resume session <p> (see "screen -list")