As mentioned in the question, what does the network setting for clamtk do? It seems that it is not clearly documented in the clamav/clamtk documentations. I have basic knowledge of what is a IP address and port however I do not understand how does is related to anti-malware software. I am also unsure of why is there a "No Proxy" option.
Does the network setting mean that clamtk is scanning for malwares in the network other than the host machine?
I am assuming environment settings means the default setting on the host machine, however I cannot find official documentation to confirm this.