| fsh |
From: http://www.lysator.liu.se/fsh/
The problem: logging in to a remote system with a cryptographic solution such as lsh or ssh takes time, due to the computationally expensive key exchanges that occur when the connection is established. It is common to trigger a lot of remote logins while using remote CVS, which makes it painfully slow compared to having the repository locally.
The solution: reuse the secure tunnel once it has been established.
fsh is a drop-in rsh-compatible replacement for ssh that automatically resuses ssh tunnels.