GML - Version 4.3 Description:Textbook Application Programming Language GML. Framed like areal book. There are 3 buttons: Back and forth arrows and return tocontent located in the middle. The application can be minimized and closedby pressing the standard buttons at the top right of the application.Description:Textbook Application Programming Language GML. Framed like areal book. There are 3 buttons: Back and forth arrows and return tocontent located in the middle. The application can be minimized and closedby pressing the standard buttons at the top right of the application.Description: