Images: ReadNotify's tracking service

During congressional hearings, Hewlett-Packard investigator Fred Adler specified how the company bugged the e-mail it sent to CNET reporter Dawn Kawamoto. HP used the services of, one of several online companies that let people plant bugs in e-mail messages and files. This is a screenshot of the ReadNotify home page.

By Bill Detwiler

Bill Detwiler is Editor in Chief of TechRepublic and the host of Cracking Open, CNET and TechRepublic's popular online show. Prior to joining TechRepublic in 2000, Bill was an IT manager, database administrator, and desktop support specialist in the ...