Activation Key License Tool
The installation of the DICOM Viewer includes the License Tool application. Check sub-folder 'License'. It holds a few short-cuts to handle your single License Key.
The License Tool is an addition to the functions available in the menu (Help/License) of the DICOM Viewer and may come in handy when your License is expired and you are denied access to the DICOM viewer menu.
Network License Keys require different functions, check the download page for the Network License Tool download.
A detailed explanation of the command-line arguments and usage of the License Tool is available here: License Tool explanation.