The RasDeleteEntry function deletes an entry from a phone book.
DWORD RasDeleteEntry(
  LPCTSTR lpszPhonebook,  // pointer to full path and filename of 
                          // phone-book file
  LPCTSTR lpszEntry       // pointer to an entry name to delete
);
 If the function succeeds, the return value is zero.
If the function fails, the return value is ERROR_INVALID_NAME.
  Windows NT: Requires version 4.0 or later.
  Windows: Requires Windows 95 OSR2 or later.
  Windows CE: Requires version 1.0 or later.
  Header: Declared in ras.h.
  Import Library: Use rasapi32.lib.
  Unicode: Implemented as Unicode and ANSI versions on Windows NT.
Remote Access Service Overview, RAS Server Administration Functions, RasCreatePhonebookEntry, RasEnumEntries