This document outlines the installation of multiple Ruby versions and their associated Devkit packages on Windows. It describes downloading Ruby 1.8.7, 2.0.0, and 2.3.0 installers as well as Devkit packages for 32-bit and 64-bit. It provides instructions to initialize and install the Devkits to support compiling native extensions. Finally, it explains how to initialize a Ruby on Rails project using Bundler to manage gem dependencies.