If you use Windows to connect to your servers, the most used software to connect using SSH are usually Putty or Cygwin. This tutorial will use Putty to allow you to connect to an amazon EC2 server.
When you build your servers you created a ".pem" file which is the public-key of a specific certificate. Putty does not understand this key, so it is necessary to create a "ppk" file - Putty Private Key.
