Thank you for your message.
Unfortunately, Host connection logs do not contain this information. We plan to add reporting features which will show connection properties that were used, including usernames.
Also, if you switch into the Detail view mode on the Viewer, you can see what user was used to log on to the Host. To enable the Detail View mode:
1. Open the main Viewer window and navigate to the tab View
2. Select the Details
3. Locate the User
Please let me know if you have other questions.