PostgreSQL 8.4
Usage:

 --help                         Display the list of valid options

 --version                      Display product information

 --optionfile <optionfile>      Installation option file
                                Default: 

 --unattendedmodeui <unattendedmodeui> Unattended Mode UI
                                Default: none
                                Allowed: none minimal minimalWithDialogs

 --debuglevel <debuglevel>      Debug information level of verbosity
                                Default: 2
                                Allowed: 0 1 2 3 4

 --mode <mode>                  Installation mode
                                Default: win32
                                Allowed: win32 unattended

 --debugtrace <debugtrace>      Debug filename
                                Default: 

 --installer-language <installer-language> Language selection
                                Default: 
                                Allowed: en es

 --extract-only <extract-only>  
                                Default: 0

 --superaccount <superaccount>  Sets the user name of the database superuser. Defaults to 'postgres'.
                                Default: postgres

 --servicename <servicename>    servicename.description
                                Default: postgresql-8.4

 --serviceaccount <serviceaccount> Sets the operating system user account that owns the server process. Defaults to 'postgres'.
                                Default: postgres

 --servicepassword <servicepassword> Sets the password for the operating system user account that owns server process. Defaults to superuser password.
                                Default: 

 --install_runtimes <install_runtimes> Specifies whether or not install the Microsoft Visual C++ runtimes before the installation proceeds.
                                Default: 1

 --create_shortcuts <create_shortcuts> Specifies whether or not menu shortcuts should be created.
                                Default: 1

 --prefix <prefix>              Installation Directory
                                Default: C:\Program Files/PostgreSQL/8.4

 --datadir <datadir>            Data Directory
                                Default: C:\Program Files/PostgreSQL/8.4/data

 --superpassword <superpassword> Password
                                Default: 

 --serverport <serverport>      Port
                                Default: 5433

 --locale <locale>              Locale
                                Default: 

 --install_plpgsql <install_plpgsql> Install pl/pgsql in template1 database?
                                Default: 1