1) The document discusses how to share your desktop, programs, PowerPoint presentations, files, and whiteboards during an instant messaging session in Lync 2013. 2) It also describes how to give control of your sharing session to other participants, take back control, and start an impromptu conference call or group chat. 3) Key sharing features covered include sharing your desktop, programs, uploading PowerPoint files to share and control slides, sending files via transfer, collaborating on a whiteboard, and starting or joining audio and video calls within chats.