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Okay , here is what I've done :

in a C++ file :

- create a global var
- register a new function to LUA
- launch execution of the LUA script
- LUA script call the registered function with a double as parameter
- the C function modify the global var

- before exiting the C program displays the global var to see if all works fine.

// --------------------------------------------------------

Here is the next problem :

I would like to PUSH a pointer to LUA (ok that a usedata lua object).
It seems (not sure) that I must use "tags"...
Unfortunately I don't understand what tags are ??
And, of course, if they are the solution to pushing and poping pointers 


Really I start to like LUA a lot !!