This may be done either prior start-up , during staging or a scheduled shutdown.
VP Link is non-invasive (does not modify the control application), easy to install and use (typically less than an hour for a Factory Acceptance Test setup) and allows for a true collaborative testing framework owing to its robust Client/Server architecture.
After start-up, VP Link is used for Management of Change (MOC) requirements, using a spare controller and operator workstation as a development node.