access history from another shell session

How does one access the history from another shell session? Let's say I was
working on a shell session from my office and gave a particularly long
tricky command. Then went home and reopened a shell. I now want to access
the history from the "other" shell session. ANy way out? I use tcsh and it
must store all the history somewhere! (Let's assume I did not kill the
shell session from my office when I left)


--
Rahul