This document provides instructions for sharing folders across different operating systems, including Windows 7, Windows XP, Mac OS, and Linux. It explains that shared folders allow easy access to files from any computer on the network that has permission. For Windows 7 specifically, it outlines six steps for sharing a specific folder, such as enabling file sharing and network discovery, selecting the folder to share, choosing which users to share with, and setting user permissions. It also discusses using public folders that are shared with all network users.