WinRunner is an automated functional GUI testing tool that allows a user to record and play back UI interactions as test scripts.As a Functional test suite, it works together with HP QuickTest Professional and supports enterprise quality assurance. It captures, verifies and replays user interactions automatically, so you can identify defects and determine whether business processes work as designed.The software implements a proprietary Test Script Language (TSL) that allows customization and parameterization of user input.