Spring batch Partitioning queries

Hi....

I am new to spring batch and trying to understand the the actual behavior of spring batch partitioning.

I have developed a demo project using paritioning [single process, multithreading]and have few questions here...
1. My input data is partitioned and given to each thread for processing.Processing has reader , processor, writer steps . IS the seaparate instance of reader, processor and writer created for each partition or thread which is handling that partition??
2. Can i use multhreading approach using throtle limit in partitioning demo?
3. How shall i proceed with remote partitioning approach ? plz guide..

thx in adv..