For each application type there is either a login programmatic method or user interface dialog to log in the application.

• Configure OAS application: Use the LogIn from the menu.
• WPF application: Use the OPCWPFDashboard.OPCWPFLogIn component with the LogIn method. (Only need to do this once for the entire application)

• WinForm application: Use the OPCControls.OPCControlsLogIn component with the LogIn method. (Only need to do this once for the entire application)

• OPCTrend control in WPF or WinForm application: Use the LogIn method. (Need to do this for each trend control)

• OPCAlarm control in WPF or WinForm application: Use the LogIn method. (Need to do this for each trend control)

• Excel: Use the security login RTD formula generated with the OAS Excel Wizard application. (Only need to do this once for the entire Workbook)

• HTML5 Web application: Use the authentication token see the Authentication topic in the Web HMI Programming Reference-HTML5 section.