Need detail document on POS Data Management

Hello every one:

Have any body used the idoc interface in POS Data Management of BW 3.5? Do you have detail material on it?

I am doing a project of bw for a retailer and we decided use the POS data management system to manage data from pos and PIPE(POS Inbound Processing Engine) to transfer data. It is said that we can transfer data by IDoc, BAPI, or other standard interfaces such as XML etc. But what i can get is just a overview of this. If any body has detail material on the PIPE, would you please kindly share them with us?