Can other people join my Non-dedicated server while am out

[Charr]

So yesterday the evening I made a non-dedicated server with my admin password and name a share it with some of my friends and everything worked fine

After of a good time of having fun my friends left the session and so do I ! At night I decided to open the session and see if everything it's fine ! Once the server loaded up I saw my friends character down on the floor like he is dead or something !

So that means that they can join the server again so I was kind of curious ! Is there any chance for them to join without me sending them an invite ? Also is there a possibility for them to write the admin password and the sessions name so they can join when ever they want ? I am playing from PC btw :) !!

[Housatonic]

Non-dedicated effectively means that your computer and client are the host. If you close the client, your server goes offline. If you're not on, no one is.
Bodies remain in the world at all times though, they fall "unconscious" when logged out.