Session connection like in warframe

[Deathnote]

Hi all, some one can help with tutorial where i can read how creat session connection like in warframe ?

I mean ..

What kind of connection you can choose, solo, only friends, on the invitation and public.

Thnks

[Deathnote]

Steel need help.

I creat steam friends connection.

But how creat private connection, on the invitation and public