This variable defines the name of the registry key under which the product's uninstallation information is stored on the target system. By default, this is set to <ProductCode>. Unless you have a good reason to change this (for example, compatibility with previous versions of the installer), we recommend that you keep this value.
You can refer to this variable as <UninstallKey>. Set this variable to the desired uninstaller registry key name. The recommended value is <ProductCode>.