The message histories that you see are stored in your personal registry file and will be not be visible to anyone else but yourself. However, if you wish to delete the message history, you can do it as follows:
1. Check that you have access to our own registry settings.
2. Make sure that AB Tutor is NOT running.
3. Select the 'Start' menu followed by 'Run'.
4. Type 'regedit.exe' in the dialog box and click on OK
5. Open the key
HKEY_CURRENT_USER\Software\ABConsulting\AB Tutor control
5: To delete all messages highlight the key ‘Messages’ in the tree structure and press the 'Delete' key.
Now, the next time you open AB Tutor, the Messages history will be empty.