7.0

n
For Horizon Agent, se the Exclude VidPid From Split policy to o:vid-xxx_pid-yyyy, where xxx and
yyyy are the appropriate IDs.
Allow automatic device splitting for desktops and specify policies for splitting specific devices on client
computers:
n
For Horizon Agent, set the Allow Auto Device Splitting policy to Allow - Override Client Setting.
n
For the client device, set the Include Vid/Pid Device filter policy to include the specific device that you
want to split; for example, vid-0781_pid-554c.
n
For the client device, set the Split Vid/Pid Device policy to vid-0781_pid-554c(exintf:00;exintf:01)
for example, to split a specified composite USB device so that interface 00 and interface 01 are excluded
from redirection.
Configuring Filter Policy Settings for USB Devices
Filter policy settings that you configure for Horizon Agent and Horizon Client establish which USB devices
can be redirected from a client computer to a remote desktop or application. USB device filtering is often
used by companies to disable the use of mass storage devices on remote desktops, or to block a specific type
of device from being forwarded, such as a USB-to-Ethernet adapter that connects the client device to the
remote desktop.
When you connect to a desktop or application, Horizon Client downloads the Horizon Agent USB policy
settings and uses them in conjunction with the Horizon Client USB policy settings to decide which USB
devices it will allow you to redirect from the client computer.
View applies any device splitting policy settings before it applies the filter policy settings. If you have split a
composite USB device, View examines each of the device's interfaces to decide which should be excluded or
included according to the filter policy settings. If you have not split a composite USB device, View applies
the filter policy settings to the entire device.
The device splitting 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.
Interaction of Agent-Enforced USB Settings
The following table shows the modifiers that specify how Horizon Client handles a Horizon Agent filter
policy setting for an agent-enforceable setting if an equivalent filter policy setting exists for Horizon Client.
Table 15‑7. Filter Modifiers for Agent-Enforceable Settings
Modifier Description
m (merge)
Horizon Client applies the Horizon Agent filter policy setting in addition to the
Horizon Client filter policy setting. In the case of Boolean, or true/false, settings, if the client
policy is not set, the agent settings are used. If the client policy is set, the agent settings are
ignored, except for the Exclude All Devices setting. If the Exclude All Devices policy
is set on the agent side, the policy overrides the client setting.
o (override)
Horizon Client uses the Horizon Agent filter policy setting instead of the Horizon Client
filter policy setting.
For example, the following policy on the agent side overrides any include rules on the client side, and only
device VID-0911_PID-149a will have an include rule applied:
IncludeVidPid: o:VID-0911_PID-149a
You can also use asterisks as wildcard characters; for example: o:vid-0911_pid-****
IMPORTANT If you configure the agent side without the o or m modifier, the configuration rule is considered
invalid and will be ignored.
Chapter 15 Using USB Devices with Remote Desktops and Applications
VMware, Inc. 223