CommunityData:Tmux

tmux lets you switch between windows (listed in the green bar at the bottom) here are several useful commands:

• Starts a new tmux: tmux (at the command line)
• Connect to an existing tmux: tmux attach (at the command line)
• Create a new window: Ctrl-b c (from within tmux)
• Switch to window N: Ctrl-b N (from within tmux)
• Disconnect from tmux: Ctrl-b d (from within tmux)

More elaborate cheat-sheets like this one (pdf) are available elsewhere.