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windows/application-management/app-v/appv-application-publishing-and-client-interaction.md
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## Dynamic configuration processing
## <a href="" id="bkmk-dynamic-config"></a>Dynamic configuration processing
Deploying App-V packages to a single machine or user is very simple. However, as organizations deploy App-V applications across business lines and geographic and political boundaries, it becomes impossible to sequence all applications with the same settings. App-V was designed to overcome this problem by capturing specific settings and configurations during sequencing in the Manifest file while also supporting modification with Dynamic Configuration files.
App-V dynamic configuration lets you specify a package policy at either the machine or user levels. Dynamic Configuration files enable sequencing engineers to modify the configuration of a package post-sequencing to address the needs of individual groups of users or machines. In some instances, it may be necessary to modify the application to provide proper functionality within the App-V environment. For example, you may need to modify the \_\*config.xml files to allow certain actions to be performed at a specified time while executing the application, like disabling a mailto extension to prevent a virtualized application from overwriting that extension from another application.
Deploying App-V packages to one machine or user is very simple. However, as organizations deploy AppV applications across business lines and geographic and political boundaries, the ability to sequence an application one time with one set of settings becomes impossible. App-V was designed for this scenario, as it captures specific settings and configurations during sequencing in the Manifest file, but also supports modification with Dynamic Configuration files.
App-V dynamic configuration allows for specifying a policy for a package either at the machine level or at the user level. The Dynamic Configuration files enable sequencing engineers to modify the configuration of a package, post-sequencing, to address the needs of individual groups of users or machines. In some instances it may be necessary to make modifications to the application to provide proper functionality within the App-V environment. For example, it may be necessary to make modifications to the \_\*config.xml files to allow certain actions to be performed at a specified time during the execution of the application, like disabling a mailto extension to prevent a virtualized application from overwriting that extension from another application.
App-V Packages contain the Manifest file inside of the appv package file, which is representative of sequencing operations and is the policy of choice unless Dynamic Configuration files are assigned to a specific package. Post-sequencing, the Dynamic Configuration files can be modified to allow the publishing of an application to different desktops or users with different extension points. The two Dynamic Configuration Files are the Dynamic Deployment Configuration (DDC) and Dynamic User Configuration (DUC) files. This section focuses on the combination of the manifest and dynamic configuration files.
App-V packages contain the Manifest file inside of the appv package file, which is representative of sequencing operations and is the policy of choice unless Dynamic Configuration files are assigned to a specific package. Post-sequencing, the Dynamic Configuration files can be modified to allow an application to be published to different desktops or users with different extension points. The two Dynamic Configuration Files are the Dynamic Deployment Configuration (DDC) and Dynamic User Configuration (DUC) files. This section focuses on the combination of the manifest and dynamic configuration files.
### Example for dynamic configuration files
The example below shows the combination of the Manifest, Deployment Configuration and User Configuration files after publishing and during normal operation. These examples are abbreviated examples of each of the files. The purpose is show the combination of the files only and not to be a complete description of the specific categories available in each of the files. For more information, download the [App-V Sequencing Guide](https://www.microsoft.com/en-us/download/details.aspx?id=27760).
The following example shows the combination of the Manifest, Deployment Configuration, and User Configuration files after publishing and during normal operation. These examples are abbreviated examples of each of the files. The purpose is show the combination of the files only, not to be a complete description of the specific categories available in each file. For more information, download the [App-V Sequencing Guide](https://www.microsoft.com/en-us/download/details.aspx?id=27760).
#### Manifest
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## Side-by-side assemblies
App-V supports the automatic packaging of side-by-side (SxS) assemblies during sequencing and deployment on the client during virtual application publishing. App-V supports capturing SxS assemblies during sequencing for assemblies not present on the sequencing machine. And for assemblies consisting of Visual C++ (Version 8 and newer) and/or MSXML run-time, the Sequencer will automatically detect and capture these dependencies even if they were not installed during monitoring. The side-by-side assemblies feature removes the limitations of previous versions of App-V, where the App-V Sequencer did not capture assemblies already present on the sequencing workstation, and privatizing the assemblies which limited to one bit version per package. This behavior resulted in deployed App-V applications to clients missing the required SxS assemblies, causing application launch failures. This forced the packaging process to document and then ensure that all assemblies required for packages were locally installed on the user’s client operating system to ensure support for the virtual applications. Based on the number of assemblies and the lack of application documentation for the required dependencies, this task was both a management and implementation challenge.
App-V supports automatic packaging of side-by-side (SxS) assemblies during sequencing and deployment on the client during virtual application publishing. App-V supports capturing SxS assemblies during sequencing for assemblies not present on the sequencing machine. For assemblies consisting of Visual C++ (Version 8 and newer) or MSXML run-time, the Sequencer will automatically detect and capture these dependencies even if they weren't installed during monitoring. The side-by-side assemblies feature removes the limitations of previous versions of App-V, where the App-V Sequencer did not capture assemblies already present on the sequencing workstation, and privatizing the assemblies which limited to one bit version per package. This behavior resulted in App-V applications deployed to clients missing the required SxS assemblies, causing application launch failures. This forced the packaging process to document and then ensure that all assemblies required for packages were locally installed on the user’s client operating system to ensure support for the virtual applications. Based on the number of assemblies and the lack of application documentation for the required dependencies, this task was both a management and implementation challenge.
Side-by-side assembly support in App-V has the following features.