Setting Up Desktop and Application Pools in View

Configuring Filter Policy Settings for USB Devices
Filter policy settings that you configure for View 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 View 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 View Agent Configuration ADM template file
(vdm_agent.adm). For more information, see “USB Settings in the View Agent Configuration ADM
Template,” on page 193.
Interaction of Agent-Enforced USB Settings
The following table shows the modifiers that specify how Horizon Client handles a View Agent filter policy
setting for an agent-enforceable setting if an equivalent filter policy setting exists for Horizon Client.
Table 14‑7. Filter Modifiers for Agent-Enforceable Settings
Modifier Description
m (merge)
Horizon Client applies the View 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 View 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.
Interaction of Client-Interpreted USB Settings
The following table shows the modifiers that specify how Horizon Client handles a View Agent filter policy
setting for a client-interpreted setting.
Chapter 14 Using USB Devices with Remote Desktops and Applications
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