•Power Management — A Monitor Saver turns off the video signal to the monitor, allowing the monitor to enter a power-saving
mode after a designated idle time. Power settings are available in Start → Control Panel → Power Options.
•Wake-on-LAN — This standard Windows Embedded Standard feature discovers all thin clients in your LAN, and enables you to
wake them up by clicking a button. This feature allows WDM software, for example, to perform image updates and remote
administration functions on devices that have been shut down or are on standby. To use this feature, the thin client power must
•Thin Client Time —After power off, clock time will not be lost as long as the power source remains on. Clock time will be lost, if
the power source is off and a battery is not installed.
Correct time should be maintained as some applications require access to local thin client time. Use the Date and Time
dialog box Start → Control Panel → Date and Time or by clicking the time area in the taskbar and then clicking the
Change date and time settings link to edit the time and date as needed.
Using the File Based Write Filter (FBWF)
The File Based Write Filter provides a secure environment for thin client computing by protecting the thin client from undesired flash
memory writes flash memory is where the operating system and functional software components reside. By preventing excessive
flash write activity, the File Based Write Filter also extends the life of the thin client. It gives the appearance of read-write access to
the flash by employing a cache to intercept all flash writes and returning success to the process that requested the I/O.
The intercepted flash writes stored in cache are available as long as the thin client remains active but are lost when the thin client is
restarted or switched off. To preserve selected changes, the selected files of the cache can be transferred to the flash manually
using Commit in the File Based Write Filter Control dialog box; alternatively, if the files affected by the changes are not known, the
changes can be made after disabling the File Based Write Filter using the File Based Write Filter Control dialog box, and then re-
enabling the File Based Write Filter, For more information, see Setting the File Based Write Filter Controls.
The File Based Write Filter can be controlled either through the command line (fbwfmgr) or by double-clicking the File Based Write
Filter icon in the Administrator system tray. The File Based Write Filter can flush specified files to the flash from cache only up to the
point when the commit is performed; if more writes are performed on the files that have been flushed, then these files must be
flushed/committed again if the additional changes also need to be preserved.
The File Based Write Filter can also be enabled/disabled through the command line or through the File Based Write Filter Enable/
Disable desktop icons. The status (enabled/disabled) of the File Based Write Filter is displayed by the File Based Write Filter status
icon in the system tray green indicates that the File Based Write Filter is enabled and red indicates that the File Based Write Filter is
• Contents of the File Based Write Filter cache should never be flushed if it is eighty-percent or more full. The Administrator
should periodically check the status of the cache and restart the thin client if the cache is more than eighty percent full.
Note that alternatively an administrator can configure the client to reboot if the FBWF cache is 90 percent or more full. By
default the client is configured to reboot if the FBWF cache usage exceeds 90 percent.
• A Terminal Services Client Access License (TSCAL) is always preserved regardless of File Based Write Filter state
(enabled or disabled). If you want to have other registry settings preserved regardless of File Based Write Filter state,
contact support for help as described in Technical Support.
WARNING: It is highly recommended that Windows write filter is kept enabled during normal use of thin clients. It should
be disabled only by administrators while making necessary changes. Extended use with write filters turned off can
reduce the life of your flash drive. It is a good practice to have write filters enabled to ensure device security.
This section provides the following information on using the File Based Write Filter:
•Changing Passwords with the File Based Write Filter
•Running File Based Write Filter Command Line Options