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The CheckedHelloPanel acts like the HelloPanel, displaying a welcome message including project name, the version, the URL as w= ell as the authors.
For Windows, it also scans the Windows registry for an entry that determ=
ines whether the product is already installed. For this purpose, the elemen=
in the <info> element =
of the installation definition file, in the for
$appName $appVersion (divided by =
a space character).
If the product was previously installed installed, a dialog will be show= n which asks whether to install a second version of the product or not.
If you use this panel do not forget to add the COIOSHelper registry feat= ure into your installation, see Windows Registry Access for more details.
See also Regi= stryInstallerListener / RegistryUninstallerListener for getting an idea= how this information in the registry can be created during an IzPack insta= llation and deleted during uninstalling.