what's up with static members?

Hi to all of you. :)

I'm trying to use a static variable in my class which is defined in a header file. The problem is that the linker won't let me do it like this:

Code:

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Error: Unresolved external 'Cell::Parent' referenced from C:\C++\NETWORK\NNMAIN.OBJ

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The class is something like this:

Code:

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// file: nnetwork.h

class Cell {
private:
  static another_class* Parent;
  //stuff...

public:
  SetParent(another_class*);
  //stuff...
};

---

which is #included in nnmain.cpp

Code:

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// file: nnmain.cpp

#include "nnetwork.h"

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I would like to know the right way to link many source files into a single executable (no dlls). Maybe i should also know the way to separate the source correctly, because this is not the first time i get this kind of errors (also when using extern) and i don't know how to solve it.

Thanks ;)

ops! :eek:
sorry, i corrected the error with the explanations on the other thread about "static". However i still get errors when i try to use extern variables.
Could someone give me a brief explanation about linkage scope and available modifiers?
Thank you.