This is the demonstration file to accompany the article, How to protect only the header and footer areas in a Microsoft Word document by Susan Harkins.

Also called "include files," because the #include statement is used to incorporate them with the program, header files use a .h extension. See precompiled header.

Basically once you've put a using namespace std; in your header, and someone has included your header, there's no way to undo the using. This can reduce your options when a name conflict occurs.