When running harmon.ie the usage data can be collected on the client by setting a set of registry keys, for more information please read Collect SharePoint usage data KB aricle. This data is useful to evaluators who are trying to get the hard facts about how the product can drive SharePoint adoption in the organization.
The collected data contains a list of all SharePoint operations that have been initiated from harmon.ie. Each SharePoint action logs the time, the Windows and SharePoint usernames, the SharePoint location, and the extension of the document file name. Passwords and full filenames are not stored in the usage data.
The user can opt to send a report with his usage data via email, by selecting Send Usage Information from the sidebar panel menu.