hi, Q: We link our opengl application with opengl32.lib from project->settings... and also we copy opengl32.dll under system22 directory, now which library file is used. Which one has the actual implementation? irrevelant question , you may not answer we frequently use stdio.h in our programs, where is its library, how is it linked?

Well when you link your program the linker must look at the opengl32.lib so that it knows that the .dll has the functions its looking for. I guess the .dll is the one thats *actually* being used but both are needed. As for stdio.h I think (correct me if im wrong) that it has its own .lib that is used but it is linked by default and the functions it has are put in your program.

maybe... I thought that we give the names of both lib''s and dll''s due to we can make static or dynamic binding. But I am not sure so I asked here.