Setting Up Desktop and Application Pools in View

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When you operate a TWAIN scanner, the TWAIN Scanner Redirection for VMware Horizon menu
provides additional options for selecting regions of an image, scanning in color, black and white, or
grayscale, and choosing other common functions.
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To display the TWAIN user interface window for TWAIN scanning software that does not display the
window by default, you can select an Always show Scanner Settings dialog option in the VMware
Horizon Scanner Redirection Preferences dialog box.
Note that most TWAIN scanning software displays the TWAIN user interface window by default. For
this software, the window is always displayed, whether you select or deselect the Always show
Scanner Settings dialog option.
NOTE If you run two RDS applications that are hosted on different farms, two scanner redirection tool tray
icons appear on the client computer. Typically, only one scanner is connected to a client computer. In this
case, both icons operate the same device, and it does not matter which icon you select. In some situations,
you might have two locally connected scanners and run two RDS applications that run on different farms. In
that case, you must open each icon to see which scanner redirection menu controls which RDS application.
For end-user instructions for operating redirected scanners, see the Using VMware Horizon Clientfor Windows
document.
Configuring Scanner Redirection Group Policy Settings
You can configure group policy settings that control the behavior of scanner redirection on your View
desktops and applications. With these policy settings, you can control centrally, from Active Directory, the
options that are available in the VMware Horizon Scanner Redirection Preferences dialog box on users'
desktops and applications.
You do not have to configure these policy settings. Scanner redirection works with the default settings that
are configured for scanning devices on remote desktops and client systems.
These policy settings affect your remote desktops and applications, not the client systems where the
physical scanners are connected. To configure these settings on your desktops and applications, add the
Scanner Redirection Group Policy Administrative Template (ADM) file in Active Directory.
Add the Scanner Redirection ADM Template in Active Directory
You can add the policy settings in the scanner redirection ADM file, vdm_agent_scanner.adm, to group policy
objects (GPOs) in Active Directory and configure the settings in the Group Policy Object Editor.
Prerequisites
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Verify that the Scanner Redirection setup option is installed on your desktops and RDS hosts. The
group policy settings have no effect if scanner redirection is not installed. See “Install View Agent on a
Virtual Machine,” on page 27.
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Verify that Active Directory GPOs are created for the scanner redirection group policy settings. The
GPOs must be linked to the OU that contains your desktops and RDS hosts. See “Active Directory
Group Policy Example,” on page 251.
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Verify that the MMC and the Group Policy Object Editor snap-in are available on your Active Directory
server.
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Familiarize yourself with scanner redirection group policy settings. See “Scanner Redirection Group
Policy Settings,” on page 167.
Setting Up Desktop and Application Pools in View
166 VMware, Inc.