The following code illustrates how to modify an entry.

   HMMCF hmmcf1;
   MMCTOCENTRY mmctocentry;
   ULONG ulFlags;
   ULONG rc;
    ...

   memset( &mmctocentry, '\0', sizeof(MMCTOCENTRY));
   rc = mmioCFChangeEntry( hmmcf1, &mmctocentry, ulFlags);
   if (rc)
     /* error */
   else
    ...