An Operator signs in by selecting his or her ID from the Operator ID pulldown list and then clicking the ‘Sign in’ button (see Figure 6). The Operator ID is used to identify who has started a procedure. Before an Operator signs in, the ‘Start’, “Abort’ and ‘Config’ buttons are inactive (grayed out). Once signed in, these buttons are active (blue), the Operator’s name is shown in the top Status Area, and the field identifier ‘Operator’ becomes functional (blue and underlined). Clicking on the field identifier ‘Operator’, in the Status Area, signs the current Operator out of the application and returns to the Sign in form.