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?
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.