--- title: "Application and Change Control" slug: "application-and-change-control" status: "update" updated: 2026-10-02T16:23:00Z published: 2026-10-02T19:02:18Z canonical: "docs.trellix.com/application-and-change-control" --- > ## Documentation Index > Fetch the complete documentation index at: https://docs.trellix.com/llms.txt > Use this file to discover all available pages before exploring further. # Application Control and Change Control ![A man working on dual monitors, analyzing data and managing tasks efficiently.](https://cdn.us.document360.io/0d453a50-e1da-4d4a-9409-fea7959614d8/Images/Documentation/acc.jpg) Application Control blocks unauthorized executables on servers, corporate desktops, and fixed-function devices. Change Control monitors and prevents changes to the file system. Application Control uses dynamic allow listing to guarantee that only trusted applications run on servers, devices, and desktops. It eliminates the need for IT administrators to manually maintain lists of approved applications. It guarantees protection without impacting productivity. With Application Control, you can prevent malicious, untrusted, or unwanted software from being executed, automatically identify trusted software and grant it authorization to run, and block users from introducing software that poses a risk to your company. Change Control allows you to write-protect and read-protect critical files from unauthorized tampering. You can also define trusted programs or users to allow updates to protected files and registry keys. A change is allowed only if it's applied according to the software policies. With Change Control, you can detect, track, and validate changes in real time, prevent changes using protection rules, and enforce approved change policies. ### What is Application and Change Control? [Application and Change Control Overview](/v1/docs/overview-13) [Key features of Application and Change Control](/v1/docs/key-features-14) [How Application Control works in a managed environment](/v1/docs/how-application-control-works-in-a-managed-environment-4) [How Change Control works in a managed environment](/v1/docs/how-change-control-works-in-a-managed-environment-4) ### Using Application and Change Control [Application and Change Control modes](/v1/docs/software-modes-5) [Enable Application and Change Control in a managed environment](/v1/docs/enable-the-software-in-a-managed-environment-5) [Using recommended configuration](/v1/docs/using-recommended-configuration-2) ### Using the command-line interface [List of Commands for Application Control and Change Control](/v1/docs/list-of-commands-for-application-control-and-change-control-1) [Command short forms](/v1/docs/command-short-forms-4) [Argument details](/v1/docs/argument-details-3) ### Using Application Control in Observe mode [What is Observe mode?](/v1/docs/what-is-observe-mode-5) [Deployment strategy](/v1/docs/deployment-strategy-2) [Deployment workflow](/v1/docs/deployment-workflow-2) [Place endpoints in Observe mode](/v1/docs/place-endpoints-in-observe-mode-5) [Exit Observe mode](/v1/docs/exit-observe-mode-5) ### Using Application Control in Inventory mode [What is Inventory mode?](/v1/docs/what-is-inventory-mode-2) [Place endpoints in Inventory mode](/v1/docs/place-endpoints-in-inventory-mode-2) [Exit Inventory mode](/v1/docs/exit-inventory-mode-2) [Inventory mode events in Trellix ePO](/v1/docs/inventory-mode-events-in-epo-saas) ### Install Application and Change Control 8.4.x for Windows (Managed) [Installation overview](/v1/docs/installation-overview-9) [Install the extension with Software Catalog on Trellix ePO](/v1/docs/install-the-extension-with-software-catalog-on-epo-on-prem) [Add the software license key](/v1/docs/add-the-software-license-key-4) [Check in the Solidcore client package to Main Repository](/v1/docs/check-in-the-solidcore-client-package-to-main-repository-4) [Install the Solidcore client with Software Catalog on Trellix ePO](/v1/docs/install-the-solidcore-client-with-software-catalog-on-epo-on-prem) [Deploy the Solidcore client to the endpoints](/v1/docs/deploy-the-solidcore-client-to-the-endpoints-4) ### Install Application and Change Control 8.4.x for Windows (Unmanaged) [Download the Solidcore client package](/v1/docs/download-the-solidcore-client-package-4) [Install Application and Change Control in interactive mode on an unmanaged system](/v1/docs/install-the-software-in-interactive-mode-on-an-unmanaged-system-1) [Install Application and Change Control in silent mode on an unmanaged system](/v1/docs/install-the-software-in-silent-mode-on-an-unmanaged-system-1) [Verify the installation](/v1/docs/verify-the-installation-1) [Enable Application and Change Control in an unmanaged environment](/v1/docs/enable-the-software-in-an-unmanaged-environment-4) ### Install Application and Change Control 6.6.x for Linux (Unmanaged) [Download the Solidcore client package](/v1/docs/download-the-solidcore-client-package-2) [Install Application and Change Control on an unmanaged system](/v1/docs/install-the-software-on-an-unmanaged-system-2) ### Upgrading to Application and Change Control 8.4.x for Windows (Managed) [Upgrade Solidcore extension with Software Catalog](/v1/docs/upgrade-solidcore-extension-with-software-catalog-4) [Verify the Solidcore extension upgrade](/v1/docs/verify-the-solidcore-extension-upgrade-4) [Add the Solidcore client package to the repository with Software Catalog](/v1/docs/add-the-solidcore-client-package-to-the-repository-with-software-catalog-4) [Upgrade the Solidcore client on the endpoints](/v1/docs/upgrade-the-solidcore-client-on-the-endpoints-4) [Verify the Solidcore client upgrade](/v1/docs/verify-the-solidcore-client-upgrade-4) ### Upgrading to Application and Change Control 8.4.x for Windows (Unmanaged) [Upgrade in interactive mode](/v1/docs/upgrade-in-interactive-mode-1) [Upgrade in silent mode](/v1/docs/upgrade-in-silent-mode-1) [Verify the upgrade on an unmanaged system](/v1/docs/verify-the-upgrade-on-an-unmanaged-system-4) ### Upgrading to Application and Change Control 6.6.x for Linux (Unmanaged) [Upgrade Application and Change Control on an unmanaged system](/v1/docs/upgrade-the-software-on-an-unmanaged-system-2) [Verify the upgrade on an unmanaged system](/v1/docs/verify-the-upgrade-on-an-unmanaged-system-2) ### Troubleshooting [Troubleshooting and logs](/v1/docs/troubleshooting-and-logs-2) [Troubleshooting Inventory issues](/v1/docs/troubleshooting-inventory-issues-2) ### Best practices for using Application and Change Control [Best practices for managing applications](/v1/docs/best-practices-for-managing-applications-1) [Application Control rules (Windows)](/v1/docs/application-control-rules-windows-2) [Tips and tricks for client deployments](/v1/docs/tips-and-tricks-for-client-deployments-2) [Managing Solidcore client tasks](/v1/docs/managing-solidcore-client-tasks-2) [Tips and tricks for server performance](/v1/docs/tips-and-tricks-for-server-performance-2) [Policy Discovery request best practices](/v1/docs/policy-discovery-request-best-practices-2) ### Product documents [Application and Change Control 9.x](/v1/docs/trellix-application-and-change-control-9-x) [Application and Change Control 8.x](/v1/docs/trellix-application-and-change-control-8-x) [Application and Change Control 6.x](/v1/docs/trellix-application-and-change-control-6-x) ### Technical Content [Supported platforms for Application and Change Control (KB87944)](https://support.trellix.com/s/article/KB87944) [Application and Change Control 8.x Known Issues (Windows) (KB87839)](https://support.trellix.com/s/article/KB87839) [Change Control 8.x.x Known Issues (KB87838)](https://support.trellix.com/s/article/KB87838) [Minimum data collection to troubleshoot Application and Change Control (KB90755)](https://support.trellix.com/s/article/KB90755)