The equivalent Windows Installer Command-Line Option is: /?.
Incorrect use of any option invokes this help option.
The description of usage can be displayed in the user interface. Displays the correct usage of the setup command including a list of all switches and behavior. The Windows Installer Command-Line Options are available with Windows Installer 3.0 and earlier versions. The command-line options that are identified in this topic are available beginning with Windows Installer 3.0.
