From: "Edward Tippelt" <santaATnospam.pobox.com> (WPS newsgroups)
From the SDK Help file, searching under "Registry table":
+ The key is to be created, if absent, when the component is installed.
- The key is to be deleted, if present, with all of its values and subkeys, when the component is uninstalled.
* The key is to be created, if absent, when the component is installed.
Additionally, the key is to be deleted, if present, with all of its values and subkeys, when the component is uninstalled.