You can configure Horizon policies to affect all client sessions, or you can apply them to affect specific desktop pools or users.
The following table describes each Horizon policy setting.
| Policy | Description |
|---|---|
| Multimedia redirection (MMR) | Determines whether MMR is enabled for client systems. MMR is a Windows Media Foundation filter that forwards multimedia data from specific codecs on remote desktops directly through a TCP socket to the client system. The data is then decoded directly on the client system, where it is played. The default value is Deny. If client systems have insufficient resources to handle local multimedia decoding, leave the setting as Deny. Multimedia Redirection (MMR) data is sent across the network without application-based encryption and might contain sensitive data, depending on the content being redirected. To ensure that this data cannot be monitored on the network, use MMR only on a secure network. |
| USB Access | Determines whether remote desktops can use USB devices connected to the client system. The default value is Allow. To prevent the use of external devices for security reasons, change the setting to Deny. |
| PCoIP hardware acceleration | Determines whether to enable hardware acceleration of the PCoIP display protocol and specifies the acceleration priority that is assigned to the PCoIP user session. This setting has an effect only if a PCoIP hardware acceleration device is present on the physical computer that hosts the remote desktop. The default value is Allow at Medium priority. |
