30. The computer-program product of claim 29 , wherein the glossary is accessible through both the definition interface and the instruction interface.
30. The computer-program product of claim 29 , wherein the glossary is accessible through both the definition interface and the instruction interface. 31. The computer-program product of claim 30 , wherein the glossary is further configured to facilitate sharing of information between different users, each of the different users belonging to a different one of the groups of users.