ClearCube PCoIP System User's Guide - Manual (Page 108)

8.4 Setting MSL from a Zero Client or Host Card Web Interface
ClearCube Technology, Inc. 101
USB plug events are blocked in the PCoIP zero client hardware for unauthorized USB devices.
The host card or VM cannot see or access the device for an additional layer of security.
The USB page is available on the host card and on the zero client but the host USB permissions
have a higher priority and update the client USB permissions. It is strongly recommended to set
the USB permissions only on the host when connecting to a PCoIP host card. Note the following:

If the host card has any permission programmed (authorized, unauthorized, or both), the
permissions are sent to the zero client. If the zero client has any unauthorized devices, they
are added to the host card’s unauthorized devices and the consolidated list is used.

If the host card does not have permissions programmed, the zero client’s permissions are used.
By default, USB permissions are not set on host cards, and any USB device is permitted on
zero clients.
NOTE: The host card USB permissions are only updated at the start of a PCoIP session. They
are authorized in the following order of priority (highest to lowest):
 Unauthorized Vendor ID/Product ID
 Authorized Vendor ID/Product ID
 Unauthorized Device Class/Sub Class/Protocol
 Authorized Device Class/Sub Class/Protocol
The following figure shows the Web interface USB page.
Figure 46. Detail from the Web interface USB page