VIAVI TestCenter: Why is a password needed to install Postgress with TestCenter?

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VIAVI TestCenter: Why is a password needed to install Postgress with TestCenter?
In windows, Postgres is installed through its own native installer, same as what you get when installing through web.  The Postgres installer expects a password, and the TestCenter installer uses "postgres" by default.  If you already have Postgres installed, please use the password that you already defined during the Postgres installation.  Please have in mind the following information: FAQ19652 - VIAVI TestCenter: Is there any restriction when using a different password than default for PostgreSQL installation?