How Instant Messaging Works
Brief history and accessible technical explanation of instant messaging, with descriptions of the major instant messaging clients available today.
http://computer.howstuffworks.com/instant-messaging.htm

Collaborative Editing of Electronic Documents
University of Pittsburgh
This document provides a brief and accessible tutorial on using the Track Changes and Comments features of Microsoft Word for collaborative editing. This is an MS Word document.
http://training.cssd.pitt.edu/downloads/WordTrackChanges.doc

Track Changes to a Microsoft Word Document
Swarthmore College
Another easy tutorial on the Track Changes and Comments features of Microsoft Word--this one with instructions for the Macintosh version of Word. This is a pdf file and requires Acrobat® Reader to view.
http://www.swarthmore.edu/Humanities/wa/WA_Program/OWL/Tracking_Changes.pdf

SharePoint Team Services Demo
Microsoft Corporation
Microsoft's SharePoint Services product extends company Web sites into tools for collaboration. Documents for collaborative editing are uploaded to libraries on a server, providing an alternative to communicating by e-mail. See the Share Documents with Team Members section of the demo.
http://www.microsoft.com/sharepoint/teamservices/evaluation/demo/default.asp