Utilities And Settings; Enhanced Write Filter - Wyse 9450XE Reference Manual

Utilities and Settings

The following utilities and settings are available for administrative use:
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Enhanced Write Filter

The Enhanced 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 Enhanced 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 the
results of writes to the registry, favorites, cookies, and so on, the contents of the cache can
be transferred (flushed) to the flash on demand by the Rapport Administrative Software or
manually using the Enhanced Write Filter Control dialog box (see "Enhanced Write Filter
Control Dialog Box" on page 48). It can be opened either through the Start | Run
command line (ewfmgr.exe C:) or by double-clicking the EWF icon in the administrator
system tray. After the Enhanced Write Filter has flushed the cache, all future writes during
the current system session are written to the flash, with no further caching until a system
restart occurs. The Enhanced Write Filter can also be enabled/disabled through the
command line or through the Enhanced Write Filter Enable/Disable desktop icons. The
status (enabled/disabled) of the Enhanced Write Filter is displayed by the Enhanced Write
Filter status icon on the taskbar system tray (green indicates that the Enhanced Write
Filter is enabled, yellow indicates that the Enhanced Write Filter is in transition and will
change on the next system start, and red indicates that the Enhanced Write Filter is
disabled).
"Enhanced Write Filter"
"NetXClean Utility" on page 50
"Local Drives" on page 51
"Mapping Network Drives" on page 52
"Domain Participation" on page 52
"WinPing Utility" on page 54
"Net and Tracert Utilities" on page 54
"User Manager" on page 55
"Changing the Computer Name" on page 57
Note
When administering the thin client for permanent changes:
-To avoid flash corruption, it is strongly recommended to flush the Enhanced
Write Filter cache immediately following a fresh restart before making
permanent modifications to the system.
-Do not flush the cache if the thin client has been used in the current system
session.
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