Portal 2 LAN co-op with one account

Source:

• https://jpstanley.blogspot.com/2011/10/playing-portal-2-co-op-on-lan-with-one.html

Start with the guest machine, this machine will play P-body - the orange robot:

• Launch Steam in offline mode.
• Start Portal 2
• Enable the developer console under 'advanced keyboard options'.
• Enter the developer console by pressing the back-quote (`) key.

On the host machine, this machine will play Atlas - the blue robot:

• Launch Steam in online mode.
• Start Portal 2.
• Enable the developer console
• Select "Play cooperative game" from the main menu.
• Select "Standard co-op"
• Wait for the "Invite friends" page to appear.
• Enter the developer console by pressing the back-quote (`) key.
• Type:

 sv_lan 1

On the guest machine type:

 connect <IP address of host machine>

On the host, for the calibration level:

 map mp_coop_start

To go to the hub immediately:

 map mp_coop_lobby_2