A couple of questions about ClamAV

I have a couple of questions about ClamAV for cPanel. We manage a bunch of customer domains. If ClamAV is installed, does this integrate into all domains that we host? So that the virus scanner feature is available under Advanced for each domain? From what I understand, ClamAV will scan all incoming emails as a default. I'm assuming it would do this for all domains that we host ? Can you disable the virus scanner for a specific domain? Not sure there would be a reason to do this. I'm assuming there isn't a user interface for ClamAV for example in Webmail? I'm assuming this is totally hands off for users/customers, runs in the background...? From what it sounds like there are domain level scanning options for manually scanning different directories, such as a web sites home directory? Although there are manual scanning options, ClamAV is always running in the background scanning incoming emails, right? And if a virus is found, this would show up in the virus scanner advanced feature for that specific domain where the infected email was inbound to? If a virus is found, is the end-user notified? Or how does a Domain Admin know if a virus is found? Anyway, just trying to learn a little more about ClamAV before we consider installing it.