SSH and Authentication
ssh-agent and ssh-add
If ssh-agent is running, this environment variable should be set:
echo $SSH_AUTH_SOCK
If not running, start ssh-agent like so
ssh-agent /bin/bash
List the identities that ssh-agent is aware of like this
ssh-add -L
Pageant
This is a tool for Windows that provides essentially the same functionality that ssh-agent provides.
Download From here: http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html