through out read programming books and I keep see this under advanced programming Techniques but it dosen't go in detail on what it's about. I was hoping someone could tell me what it dose if it dose anything and is it a good idea to use it. because i see it use in one section of the book and never see it again and i don't see anyone on forums or other website use it ether, so if someone can help me thanks........Code:int main(int argc, char *argv[])