Forwarding methods (as described in Message Forwarding) and dynamic method resolution are, largely, orthogonal.
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If you implement resolveInstanceMethod: but want particular selectors to actually be forwarded via the forwarding mechanism, you return NO for those selectors.
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The new code is incorporated into the program and treated identically to classes and categories loaded at the start.
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For example, the various modules in the System Preferences application are dynamically loaded.
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Others can write modules that your program loads at runtime—much as Interface Builder loads custom palettes and the OS X System Preferences application loads custom preference modules\
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They contribute to it in ways that you permit but could not have anticipated or defined yourself. You provide the framework, but others provide the code
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See the NSBundle class specification in the Foundation framework reference for information on the NSBundle class and its use.
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