Accessing computer without Internet but via LAN cable

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Hello,

I was trying this:

https://community.teamviewer.com/t5/Knowledge-Base/Can-TeamViewer-be-used-within-a-local-network-LAN-only/ta-p/4618 

on two laptops that are Not connected to the internet or to a modem/router.  They are only connected to ech otehr by a crossed LAN cable. Ping says the connection is OK. and sharing disks is working. I have set the setting to "accept exclusively incoming LAN connections" but when trying TV can't connect. 

Has anybody an idey where this goes wrong ?

It's my intention to access a NetTop W7 computer from a W10 Laptop on a remote travel and I don't want to take a screen and keyboard along to use the NetTop.