Are EasySSO Server Licenses Still Available to Purchase?
No.
The account must be a dedicated computer account and a password must be set explicitly.
An account can be created (also known as "pre-staged") using standard Microsoft tools as described in this Technet article.
Password can be set from the command line using the following command described in this Technet article.
net user <username$> <password> /domain
Once configured (with the computer account) EasySSO starts playing a role of a computer on your network, for the purpose of authentication.
The underlying process is similar to those happening when a user is trying to access a shared drive on another machine.