7.0

Configuring Device Splitting Policy Settings for Composite USB Devices
Composite USB devices consist of a combination of two or more different devices, such as a video input
device and a storage device or a microphone and a mouse device. If you want to allow one or more of the
components to be available for redirection, you can split the composite device into its component interfaces,
exclude certain interfaces from redirection and include others.
You can set a policy that automatically splits composite devices. If automatic device splitting does not work
for a specific device, or if automatic splitting does not produce the results your application requires, you can
split composite devices manually.
Automatic Device Splitting
If you enable automatic device splitting View attempts to split the functions, or devices, in a composite
device according to the filter rules that are in effect. For example, a dictation microphone might be split
automatically so that the mouse device remains local to the client, but the rest of the devices are forwarded
to the remote desktop.
The following table shows how the value of the Allow Auto Device Splitting setting determines whether
Horizon Client attempts to split composite USB devices automatically. By default, automatic splitting is
disabled.
Table 15‑4. Effect of Combining Disable Automatic Splitting Policies
Allow Auto Device Splitting Policy
on Horizon Agent
Allow Auto Device Splitting Policy
on Horizon Client
Combined Effective Allow Auto
Device Splitting Policy
Allow - Default Client Setting false (automatic splitting disabled)
Automatic splitting disabled
Allow - Default Client Setting true (automatic splitting enabled)
Automatic splitting enabled
Allow - Default Client Setting
Not defined Automatic splitting enabled
Allow - Override Client Setting
Any or not defined Automatic splitting enabled
Not defined Not defined Automatic splitting disabled
NOTE These policies are included in the Horizon Agent Configuration ADM template file (vdm_agent.adm).
For more information, see “USB Settings in the Horizon Agent Configuration ADM Template,” on page 227.
By default, View disables automatic splitting, and excludes any audio-output, keyboard, mouse, or smart-
card components of a composite USB device from redirection.
View applies the device splitting policy settings before it applies any filter policy settings. If you have
enabled automatic splitting and do not explicitly exclude a composite USB device from being split by
specifying its vendor and product IDs, View examines each interface of the composite USB device to decide
which interfaces should be excluded or included according to the filter policy settings. If you have disabled
automatic device splitting and do not explicitly specify the vendor and product IDs of a composite USB
device that you want to split, View applies the filter policy settings to the entire device.
If you enable automatic splitting, you can use the Exclude Vid/Pid Device From Split policy to specify the
composite USB devices that you want to exclude from splitting.
Chapter 15 Using USB Devices with Remote Desktops and Applications
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