how to reconnect to a session?

OK, I connect to a RH 7.3 server with ssh and su
to root. I'm editing a config file. I switch
windows to work on something else. I come back
and my ssh session has dropped. I reconnect and
su to root again. I type "w" and can see my
original session in there. How can I get back
into that session, and finish editing what I
started?

Scott


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