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Using USB Printers
A USB printer is a printer that is attached to a USB port on the local client system. To send print jobs to a
USB printer, you can use the USB redirection feature, or use the virtual printing feature. USB printing can
sometimes be faster than virtual printing, depending on network conditions.
Virtual printers and redirected USB printers can work together without conflict.
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You can use the USB redirection feature to attach a USB printer to a virtual USB port in the remote
desktop as long as the required drivers are also installed on the remote desktop.
If you use this redirection feature the printer is no longer logically attached to the physical USB port
on the client and this is why the USB printer does not appear in the list of local printers on the local
client machine. This also means that you can print to the USB printer from the remote desktop but not
from the local client machine.
In the remote desktop, redirected USB printers appear as <printer_name>.
For information about how to connect a USB printer, see Use USB Redirection to Connect USB
Devices.
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On some clients, you can alternatively use the virtual printing feature to send print jobs to a USB
printer. If you use the virtual printing feature you can print to the USB printer from both the remote
desktop and the local client, and you do not need to install print drivers on the remote desktop.
PCoIP Client-Side Image Cache
PCoIP client-side image caching stores image content on the client to avoid retransmission. This feature
reduces bandwidth usage.
The PCoIP image cache captures spatial, as well as temporal, redundancy. For example, when you scroll
down through a PDF document, new content appears from the bottom of the window and the oldest
content disappears from the top of the window. All the other content remains constant and moves upward.
The PCoIP image cache is capable of detecting this spatial and temporal redundancy.
Because during scrolling, the display information sent to the client device is primarily a sequence of cache
indices, using the image cache saves a significant amount of bandwidth. This efficient scrolling has
benefits both on the LAN and over the WAN.
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On the LAN, where bandwidth is relatively unconstrained, using client-side image caching delivers
significant bandwidth savings.
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Over the WAN, to stay within the available bandwidth constraints, scrolling performance would be
degraded without client-side caching. Over the WAN, client-side caching saves bandwidth and ensure
a smooth, highly responsive scrolling experience.
With client-side caching, the client stores portions of the display that were previously transmitted. The
cache size is 250 MB.
VMware Horizon Client for Mac Installation and Setup Guide
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