Core configuration Core configuration encompasses changes made to the platform as well as supporting applications. These changes can affect global settings as well as settings for particular applications. These settings include: Form administration and lists: change the behavior and appearance of forms and lists. Navigation and UI and search: configure how users browse and search in the platform. Time and performance: keep your organization running and on time. Localization and mobile device support: take the platform anywhere. Plugins and out-of-box appendix: expand the platform to fit your needs. Activate a pluginYou can activate most plugins. Some features require a separate subscription from the rest of the Now Platform. Some plugins require a purchased subscription before activation. Some plugins must be activated by ServiceNow personnel.Available system propertiesThis page describes properties available to an instance.Handle HTTP 500 errorsThe HTTP 500 error is a generic error message that Internet Explorer passes to you when your web site errors for one reason or another, but it provides no useful information by itself.Query join and complexity size limitsThe platform uses a relational database to store data. Retrieving data can involve multiple joins to create a single result set. While these joins are usually simple, in certain cases the system may issue very large joins to bring together large numbers (>20) of tables.Tables and classesAdministrators can use the schema map, Tables module, or the system dictionary to determine which system tables extend other tables.Web proxySeveral properties support Web proxy configuration.