Brain as a centralized potfile?

[mtnsec]

I'm still trying to understand the brain, so hopefully this question makes sense:

Looking at the features:

- [ Brain Client Features ] -

 # | Features
===+========
 1 | Send hashed passwords
 2 | Send attack positions
 3 | Send hashed passwords and attack positions


1.  For sending hashed passwords, does this mean every possible candidate that hashcat is checking?

2.  For sending attack positions - is there an example of what this means anywhere?

3.  Can the brain be used as a centralized potfile to track successfully cracked hashes?