    - If 'yes', the environment variable PGPASSWORD is used to
      temporarily store the password you type on the "Open database
      window", between pressing the 'OK' button and the actual opening
      of the database.

    - If 'no', the environment variable PGPASSWORD is not used and you
      are not prompted for a password when opening a database, but you
      need a properly configured password file. See subsection "The
      Password File" in the libpq C-library of the PostgreSQL
      documentation for more details.

Default: 'yes'

Note: According to the postgresql documentation, the use of the
      environment variable PGPASSWORD is deprecated for security
      reasons. See subsection "Environment variables" in the "libpq
      C-library" section of the PostgreSQL documentation for more
      details.

