Private properties are used internally by the installer and their values must be entered into the database by the author of the installation package or set by the installer during the installation to values determined by the operating environment. The only way a user can interact with private properties is through Control Events in the package's authored user interface. Private property names must include lowercase letters.
Public Properties
Public properties can be authored into the installation database in the same way as private properties. In addition, the values of public properties can be changed by a user or system administrator by setting the property on the command line, by applying a transform, or by interacting with an authored user interface. Public property names cannot contain lowercase letters.
