title: What happens when I run "ssh git@gitlab.com
body: <p>I have tried google it and check the gitlab-documentation but did not find a good answer for this.</p>
  <p>When I setup GitLab I am advised to test my SSH-keys to my GitLab URL instance.
  I use git@gitlab.com.</p>
  <p>What actually happens when I run &quot;ssh git@gitlab.com&quot;
  I understand how you use SSH to login to a remote device e.g. Cisco Router with SSH Admin. But in this case: who is git@gitlab.com? [username]@gitlab.com makes more sense to me.</p>
  <p>Somehow it must find my Gitlab account (since it is there my public key is stored). How can I do that when I use a generic git@gitlab.com ?</p>
  <p>I am after a more step-by-step answer (Client-Server)</p>