Hiho, how do I use a variable ( for example hwnd ) in more than one .cpp files ?? I created a window in main.cpp and I need the window handle in some other cpp files. I declared it in global.h which I included in all my .cpp files. But then I recieve a linker error which says that the variables declared in global.h are declared twice or more. What can I do to solve this ?? thx

you put

extern HWND hwnd; //extern type var;

where you would declare your globals in the other cpp.

Ah,
thanx !!