Vector PC-Duo Technical Information Page 83

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Host Operation
83
Screen tab
the includes two different types of screen capture technology:
Kernel-mode screen capture: Uses kernel-mode drivers to capture screen data. This
is the default option on Windows XP, Windows 2003 Server and older platforms.
Display Filter Driver (DFD): kernel-mode code supported on Windows XP, x86
only. Requires kernel-mode driver to process data. Installed by default, but
activated only if the Mirror Display Driver is not loaded.
Mirror Display Driver (DSP): kernel-mode code supported on Windows XP, and
Windows Server 2003, in both x86 and x64. Requires kernel-mode driver to process
data. Installed and activated by default. Can be disabled in Device Manager.
User-mode screen capture: Uses user-mode code to capture screen data. This is
the default option on Windows Vista and Window Server 2008 platforms but can also be
used on Windows XP, Windows 2003 and older platforms.
User Mode Screen Capture (UMSC): user-mode code supported on Windows XP,
Windows Server 2003, Windows Vista, and Windows Server 2008. Runs as 32-bit
x86 user mode code, but can capture either x86 or x64 systems. Only supported
screen capture technology for Windows Vista and Windows Server 2008, and in
Terminal Services sessions (any OS).
When user-mode screen capture is selected, the amount of bandwidth used to capture
and transmit remote desktop screen can be restricted or "throttled" by reconfiguring a
user-mode screen capture profile. The default profile is "High Quality/High Bandwidth"
but other profiles corresponding to smaller bandwidth limits are available. See
"Bandwidth throttling" for more information.
The Screen tab indicates which algorithm is currently preferred. If the preferred algorithm
is user-mode, then the preferred user-mode screen capture profile is also indicated.
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