Building Remote Administration Tools

I would like to build a RAT in C++, for the educational value. Anybody have any tips on which features to incorporate into it, how to go about programming those features, or just advice in general?

Start with something that you already use regularly yourself, e.g.: remote services, registry or desktop. Then only use your version and keep building in new features as you need them.

Thanks for the advice. I plan on starting out with a simple remote DOS RAT. I think making the servers undetectable is going to be a bit of a problem, so I'll have to implement a dynamic crypter somewhere along the line.