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Is there a way to open a new Terminal in an existing SSH session? I am logged into a remote system and have a special session that I have to request and wait to receive. I know I can then use the "xterm &" command to open multiple xterm windows within that session, but xterm behaves differently from OSX's built-in Terminal. Is there a way to open multiple Terminal windows within the existing SSH session?

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    tmux is available through homebrew haven't used it myself tho... tmux.github.io – AllInOne Jan 4 '17 at 20:05
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Yes, you can reuse exiting ssh connection and open ssh in whatever terminal you like. See this answer to a StackOverflow question for details:

If you open the first connection with -M:

ssh -M $REMOTEHOST

subsequent connections to $REMOTEHOST will "piggyback" on the connection established by the master ssh. Most noticeably, further authentication is not required. See man ssh_config under "ControlMaster" for more details. Use -S to specify the path to the shared socket; I'm not sure what the default is, because I configure connection sharing using the configuration file instead.

In my .ssh/config file, I have the following lines:

host *
  ControlMaster auto
  ControlPath ~/.ssh/ssh_mux_%h_%p_%r

This way, I don't have to remember to use -M or -S; ssh figures out if a sharable connection already exists for the host/port/username combination and uses that if possible.

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