HPE Retrofit is part of the Hewlett Packard Enterprise section, and it's used in that category, but there is no actual information related to the way it works. If you have it installed, start it or locate the installation directory. There should be some manuals in PDF or CHM format. Use them to read about the application. If you can't find anything and don't have any HP-related application installed on your PC, remove it from the Uninstall a Program in Control Panel.