How to use a DLL?

I have never used a DLL before and I don't know how.
Could some one give me some example script?
For both the DLL and the program?
Thanks, August.

Creating win32 DLL
Build and Use Simple DLL
Super-Easy DLL

Note: second link, &lt are less than signs ('<'). Essentially you fill a DLL with code, and you link the generated .lib or LoadLibrary the .dll at run time (both lib and dll are created from compilation). MSDN explains this concept very well,however I really like all 3 articles.