How to change parameter on Linux when i want to install NW7 for oracle

Hi everybody

I have get the guide of install NW7, that below list of documents are required:

Master Guide

Installation Guide

OSD

I have question of what is OSD? OS meaning is Operation System, I want to get what D naming with?

and how to get OSD docment form service.sap.com or sdn@sap

Could any one to ask the questions? thanks!