I have the same question and emailed ZA it about last week. They sent me a very long reply that completely avoided answering the essence of my question: What is the risk of allowing the "Generic Host Process" access to the internet or, especially, allowing it to act as a server? I also asked about ICQ because it wants to act as a server also (I never allow it to do so). However, I have no clue why it needs to act as a server or the consequences/benefits of not allowing this.
Any insight into this would certainly be appreciated.