Design Recommendations

Hi Guys,

I am currently working on cross platform chat client-server application. Client is created using Qt. I was wondering if you guys can please suggest some design patterns which I should look into which can be used in this project.

I am really new to design patterns and was hoping to get some hands on experience on them. Also it would be really great if you guys can suggest some other designs which I can incorporate into this project.

Thanks
Not so much a pattern, but a recommendation: how about reusing the IRC protocol?
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