HOST 3.22.007 implements a different alliance system ("locking alliance friendly codes"). PHost does not implement this system, because PHost's system is older and we believe it's more flexible.
When one player ("Alice") offers an alliance to another one ("Bob") in HOST, this has the following effects:
- Bob will be immune to Alice's minefields.
- Bob will not be able to sweep Alice's minefields.
- Alice will not attack Bob.
- Bob will be able to beam up stuff from Alice's planets.
This is approximately the same as offering Mine Level, Combat Level and Planet Level in PHost.
HOST 3.22.036 adds a second level of alliance, named "FF allies". When Alice offers this level to Bob, Bob will get all the above benefits, plus he will see all the ship Alice sees. This roughly equals offering the Vision Level in PHost. There is no equivalent to PHost's Ship Level in HOST.