If you recall, Microsoft limited the number of machines that connect to non-server versions of Windows to 5 and for a few versions 10. Most machines will not let more than 5 machines connect and I've seen this number drop to just 2 machines as some goof in counting counted 2 shares from 1 machine as "2."
So with that out of the way you have to do that SAME OLD THING AS BEFORE with accounts since no one wants to enable the GUEST ACCOUNT today (too dangerous in my opinion.)
If you forgot, here's the quick rundown.
Let's say the user account names count are seven in total. Rather than use the Seven Dwarfs I'll use A to F. Abe, Bob, Charles, Dave, Edna and Frank.
When you get on your "server" Abe, Bob, Charles, Dave, Edna and Frank must have accounts on every machine they need to access PLUS the share must give them access to said share.
I am running Windows 7 on six computers. I can see all of the six and they can see mine. I have finally figured out through some internet research, how to get their computers to access mine. However, when I go from my computer to theirs, I get asked to enter a network password. All of the password protection is off. It's saying something I'm not understanding underneath the user name and password request boxes. It says Domain: and has my PC name on it. How can I get the access to go on their PC's?