LAN Co-op

[Litchi_Borrower]

I am going to get myself a new computer soon, and would like to play the co-op in LAN without buying a second copy of the game.
I would like to know if I can play it on both machines at the same time with a single account, with two different accounts in family mode or only by launching the game with steam in offline mode (and, from what I've heard, lose progress after server shutdown).

[MobiusPizza]

If your steam is offline you can't play coop, I think.
Maybe you could buy the game, share it with 2 another accounts and play with those 2. I think that could work.

[Litchi_Borrower]

I belive you can force LAN coop through console commands, even if steam is offline, but your progress won't be saved.
And as I stated I'd like not to buy a second copy of the game just to play in LAN, as I'm mainly doing it to play local coop with two mice and keyboards, wich you are able to do with a single copy if using a controller.