IRC protocols and insecurity

Hello,

I've been looking for any white papers that describe the 
security/technical aspects of the IRC protocol, but so far just found 
mIRC exploits and insecurities.

I'm trying to secure a building network based on an OpenBSD 3.5 server 
and Win32 clients.

As the clients purpose are just for file sharing, email, internet 
access, instant messaging and some irc usage for the students.

How can I secure/scan for virii what the members are downloading via 
IRC? How about the possibilities of hijacking connections via IRC? What 
are the threats that can come to this network via the IRC protocol?

Thanks and best regards.

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