HP WinRunner software was an automated functional GUI testing tool that allowed a user to record and play back UI interactions as test scripts. As a functional test suite, it worked with HP QuickTest Professional and supported enterprise quality assurance. It captured, verified and replayed user interactions automatically, in order to identify defects and determine whether business processes worked as designed. The software implemented a proprietary Test Script Language (TSL) that allowed customization and parameterization of user input. HP WinRunner was originally written by Mercury Interactive. Mercury Interactive was subsequently acquired by Hewlett Packard (HP) in 2006. On February 15, 2008, HP Software Division announced the end of support for HP WinRunner versions 7.5, 7.6, 8.0, 8.2, 9.2—suggesting migration to HP Functional Testing software as a replacement.