I researched the site and I know you have the same account on the PC that is going to share the files in order to share only to specific accounts, but this seems messy to me.
Imagine you can share a lot of different folders to different people, it could become a mess to have so many accounts in your PC you don't even use.
Isn't there any other way without using domains or third party software?
In the windows where you add accounts for the share permissions, theres a button that says "location" and there appears your own machines name. However I wonder why a PC could not detect another PC and it's created accounts to add them to share permissions list. Isn't it possible in any way?
Isn't there a way by typing specifically a full user path with the workgroup or machine and account name?