This action goes to the specified URL.
DISPLAY URL ArithmeticOperation() [USING StringLiteral() ] [ IN NEW | IN MAIN | FULL SCREEN]
where ArithmeticOperation is an operation that produces a string (usually just a string literal).
DISPLAY URL 'http://www.awareim.com'
IN NEW WINDOW, IN MAIN WINDOW, IN CURRENT TAB, NEW TAB and FULL SCREEN options allow to display the URL in a new window, in the main window, in the current tab, in the new tab, or in the same window full screen respectively.
The USING keyword can be used to specify the fully qualified name of the plugin that can perform some actions before the URL is displayed. Currently this is mainly used for integration with Stripe payments (see this video tutorial for details).