The Contact History tab shows a list of any modifications that have been made to the fields of the selected Contact since that Contact was first saved.

The functions of the buttons are:

Print Clicking this button will send the information shown on this tab to the printer.
Filter Query Clicking this button will bring up a window that will allow you to search the database’s entire modification history.
Refresh Record Clicking this button will reload the data to reflect any changes that have been made to the contact since you initially queried it. This prevents you from being forced to clear the query and re-query the contact in order to see changes that may have been made by another user while you were viewing this contact.