> For the complete documentation index, see [llms.txt](https://docs.parallels.com/landing/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.parallels.com/landing/ras-admin-guide/parallels-ras-21-administrators-guide/universal-scanning/managing-universal-scanning.md).

# Managing Universal Scanning

Universal Scanning uses TWAIN and WIA redirection to let any application using either technology hardware connected to the client device for scanning. With Universal Scanning there is no need to install a specific scanner driver on the server.

{% hint style="info" %}
**Note:** The server feature **Desktop Experience** is required in order to enable both WIA and TWAIN scanning on RD Session Hosts.
{% endhint %}

To configure Universal Scanning, select the **Universal Scanning** category in the RAS Console.

By default, the Universal Scanning driver is automatically installed with RD Session Host, Guest VM, and Remote PC agents. Therefore, upon adding a server to the Farm the Universal Scanning is installed.

### Configuring a Scanning Rename Pattern

By default, Parallels RAS renames scanners using the following pattern: `%SCANNERNAME% for %USERNAME% by RAS`. For example, if a user named Lois, who has SCANNER1 installed locally, connects to a remote desktop or published application, her scanner is renamed to "SCANNER1 for Lois by RAS".

To change the pattern used to rename scanners, specify a new pattern in the **Scanner rename pattern** input field. The variables that you can use for renaming are:

* `%SCANNERNAME%` — client-side scanner name.
* `%USERNAME%` — username of the user connected to the server.
* `%SESSIONID%` — ID of the active session.

You can configure a different renaming pattern specifically for each server in the list.

{% hint style="info" %}
**Note:** Redirected scanners are only accessible by the administrator and the user who redirected the scanner.
{% endhint %}

### Enabling and Disabling Universal Scanning Support

To enable or disable the WIA or Twain Universal Scanning support for a particular server, click the **WIA** tab or the **TWAIN** tab, then right-click a server and click **Enable** or **Disable** in the context menu.


---

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