The Developer Tools area is useful for on-premise deployments. You can access developer tools in the admin area under Administration-->Developer Tools.
- Clear Cache - If you are doing custom development work in the code, you might need to clear cache to ensure changes are applied in your browser. Click the run button to clear the cache.
- System Check- Make sure the application is properly configured. Click the run button to run a system diagnostic of your installation.
- Update Custom Data - This is related to custom development work. Click the Run button to load the new metadata.