Progress ada banyak tuh gan productnya. Yg lo maksud kayaknya OpenEdge ABL (Advanced Business Language), ato dulu disebut Progress 4GL. Kalo mau belajar, liat aja di websitenya di sini nih: http://documentation.progress.com/output/OpenEdge113/oe113html/wwhelp/wwhimpl/js/html/wwhelp.htm#href=ABL/ABL
