High Quality Content by WIKIPEDIA articles A filter driver is a
Microsoft Windows driver that adds value to peripheral devices or
supports a specialized device in the personal computer. It is a
driver/program/module that is inserted into the existing driver
stack to perform some specific function. A filter driver should not
affect the normal working of the existing driver stack in any major
way. Written either by Microsoft or the vendor of the hardware, any
number of filter drivers can be added to Windows. Upper level
filter drivers sit above the primary driver for the device (the
function driver), while lower level filter drivers sit below the
function driver and above the bus driver. Filters may work on a
certain brand of device such as a mouse or keyboard, or they may
perform some operation on a class of devices, such as any mouse or
any keyboard. Another type of filter driver is the bus filter
driver, which may be added on top of the bus driver. For example,
an ACPI bus filter is added to support power management for each
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