Telecom Computer Security Databases Handheld Devices Tech.
Communication can be to inform, to pass a message to make a person aware.
If you equate knowledge with the ability to perform, explain and teach, then sharing knowledge has a requirement of reciprocity, a need for dialog that goes beyond just hearing a message or being told. I do not think that was the point of the question. I understood Shelley to be asking how to compare the functionality and utility of KM software products for knowledge sharing.