\c -4 -6 force use of IPv4 or IPv6
\c -C enable compression
\c -i key private key file for authentication
+\c -noagent disable use of Pageant
+\c -agent enable use of Pageant
\c -m file read remote command(s) from file
\c -s remote command is an SSH subsystem (SSH-2 only)
\c -N don't start a shell/command (SSH-2 only)