> Where and how do we define those variables?
> My understanding is that they should be declared in main.h so 

The magic is in the separation of defining and declaring (iirc the
correct words):

in the .h: external int foo;

in one of the .c: int foo;

It is the same trick you use (probably without knowning) for functions:

.h:   foo();
.c:   foo(){...}

Wouter van Ooijen

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