As with many systems, properties files are used to configure various default settings for the Dashboard. These are not limited to, but include:
Database settings
For more information about configuring the database connection, refer to Section 2.2.3, Configuring the Dashboard Database
Portal Time Zone
For more information about setting the time zone, refer to Section 2.2.4, Verifying the Dashboard Default Time Zone for User Accounts.
Auto-Login
For information about configuring auto-login with your Web Server, refer to Section 3.3.1, Implementing Auto-Login with Your Web Server.
Session timeout
For information about setting and disabling session timeout, refer to Section 3.4, Setting Session Timeout.
Synchronization with Operations Center
For information about access control synchronizer settings, refer to Section 4.1.2, Updating Access Control Synchronizer Settings.
Disabling of Self-Service Use Account Creation, Authentication and Notification Settings
For information self-service features on account creation, refer to Section 4.4.1, Self-Service User Account Creation, Authentication and Notification Settings.
Setting of default home pages for user groups.
For information configuring a home page based on user groups, communities and organization memberships, refer to Section 5.8, Configuring Default Home for User Groups, Communities and Organizations.
Configuration settings for Liferay servlets, portlets, and standard functionality.
For example, set the my.places.max.elements property to set the number of items (communities and organizations) shown in the Welcome drop-down list under My Places.
Liferay portal settings are defined in the portal.properties file. Other settings necessary to integrate Operations Center and Operations Center portlets are defined in the portal-ext.properties file. Do not modify this file, as you might overwrite any update process that is already running. Instead, custom configurations should always be made in the portal-ext.custom.properties file.
Configurations in the portal-ext.custom.properties file always take precedence over settings in the portal-ext.properties file, which in turn always take precedence over settings in the portal.properties file.
For information about configurations that can be made to the Dashboard, through the portal-ext.custom.properties, see http://www.liferay.com/community/wiki/-/wiki/MainPortal+Properties+5.2.3