Page is a not externally linkable
tedster - 12:56 am on Oct 12, 2010 (gmt 0)
/page_B.html
...that link points to http://www.example.com/page_B.html. The beginning slash means "start at the domain root". That's true no matter what the URL of the source page may be.
page_C.html
... this link resolves differently in different cases. Without the beginning slash, the full URL begins with the directory where the source page "lives".