CYGWIN : ssh-agent

Create your keys using ssh-keygen (see previous ssh-agent procedure).
Copy your key to the target servers (again see the previous procedure).
Then either run the following: –

eval ssh-agent
ssh-add
enter the passphrase generated earlier

or add the eval and ssh-add to a script and call to the current shell
e.g.

. ./start_agent (where start_agent contains the commands above).