First a new iterator is created. Then for myCount iterations, the iterator accesses the next key-value pair. If the count is 0 (the first element) then retrieve the first pair. For all other counts retrieve the next pair.
NOTE 
Key-value pairs are sometimes referred to as associations..
      // example using TDiskDictionaryIterator
      TDiskDictionaryIterator* myIterator = new TDiskDictionaryIterator(dict);
      
      for (i=0; i=myCount; i++ ) {
          if (i==0)
              myAssoc = myIterator->First();
          else
              myAssoc = myIterator->Next();
          if (myAssoc)
              delete myAssoc;
          else
              {
              qprintf("No Assoc exists for i = %d  ",i);
              if (i == myCount)
                  qprintf("This is expected.\n");
              else
                  qprintf("This is NOT expected!\n");
              break;
              }
      }
      delete myIterator;