Various message boxes appear while the program is run. Information, error, warning and question messages are used. The types used in this program have OK, YES-NO and YES-NO-CANCEL buttons. All message boxes respond to the <esc> key that has the same effect as clicking the "close" button. Most messages are created by a single common dialog that simplifies control of the elapsed time clock when another program is run before the message dialog is closed. For message boxes created in this latter manner, the "close" button and <esc> key have been programmed to just close the dialog for the OK type, act as if NO were selected for the YES-NO type and act as if CANCEL were selected for the YES-NO-CANCEL type.