Runtime system and weird types

When many of objective-c's unique features and 2.0 additions are discussed, it is often said that they depend on the "runtime system" in order to function. What is it? It almost sounds like a virtual machine, but somehow I doubt that.
Also, what is the difference between both Null, nill, and nil, and Bool and BOOL?
Any help is greatly appreciated.

palms831 wrote:
First of all, what is meant by linking against something, and what does linking in general mean? I know it's part of the compilation process, but my knowledge is pretty fuzzy beyond that.
Actually, it is not part of the compilation process. It is part of the building process, but that is different. Compiling takes a symbolic language and converts it into its equivalent machine language. Linking goes through all of the compiled object code and connects functions with their associated function calls. It will then construct some sort of "runtime object" (such as an application or shared library) that can actually be used.
Also, I know that when I instantiate an object I am sending a message to a class object. What I'd like to know is when that class object is created, and what determines which classes get instantiated and which don't.
Any class that you create will get instantiated. (Though one normally doesn't refer to classes being instantiated. Objective-C just happens to have a powerful runtime language that allows you to treat classes almost as if they were objects). A good linker will take any instantiated classes or functions that are never used and remove them from the executable. GCC and other UNIX linkers usually cannot do this. They can only remove unused object files that contain nothing but unused functions. That is why the Linux kernel contains so many tiny files with only one function. Microsoft, Borland, and Codewarrior Linkers were much better at this.

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    At the beginning we configured ONLY the runtime development for the DEVELOP track. So the work o teh developers was deployed automatically on that system as they activate their activities into the Developer studio.
    As traiing we released the activities and we saw them into teh Consolidation tab queue ready for transport (NO Consolidation runtime system was in place).
    Anyway we selected them and run the import. The CMS said it gone well.
    After that the activities of the developers were into the Assebly tab queue.
    My dubt is that after the import we saw our application working fine on the envirnment indicated as runtime develop system.
    I need to clarify if this is the correct behaviour:
    A) In this case using only the development runtime system into a track it does not have sense to relase the activities.
    The development activity then end at that point and there is nothing else to do into the CMS.
    If you need at that point the SCA of your work, to import them elewhere you can find it under the ../Jtrans directory (on condition that you reeased them)
    Right?
    B) It's an bug of the CMS to allow to run the import from the Consolidation tab while there is no consolidation runtime registered ?
    Or it do not represents a real, physical import of software but only a logical step needed to move ahead the sw ?
    we suppose when we run the import from the Consolidation tab queue we overwritten again the application on the development runtime system, but I'm not sure of that.

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