No go.
I have been through all the issues in your link above on both computers. I have looked up the IP addresses in the modem for each laptop and put them in the hosts file. It works.
But when I open up the computers next morning and the modem turns on it has changed the IP addresses and no longer works. So I have to change the hosts file again.
I tried setting the hosts file back to the original (blank) but I am back to laptop A being able to access A and B, but laptop B not even listing A in the Network. Only after a restart of B will it see and contact A.
Next suggestion?