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From: Mike Carlisle on 5 Dec 2006 15:06
Thanks for your help, that helps me understand what's going a little clearer.

"Eliyas Yakub [MSFT]" wrote:

> Ctrlcap filter is installed as a class filter. This filter was originally
> written for NT4.0 by sysinternals and ported to Win2K. This filter doesn't
> work well in scenarios - terminal server, SMS, etc, and I would strongly
> discourage you from using this filter. This filter sits above the kbdclass
> filter driver.
>
> The filter driver present in the WDK (both WDF and WDM versions) is a device
> filter. This filter is intended to filter just PS/2 device. It sits
> between the kbdclass and i8042prt driver. You install such a filter a full
> fledged pnp device INF. You cannot install a device filter by right
> clicking on the INF file. The information about device filters is added to
> the device enum key as opposed to class key for class filters. The sample
> contains an INF that shows how to install this filter.
>
> If you want your filter driver to filter all device types (USB, PS2, etc)
> then you can install this filter as class filter using the install app
> provided with the ctrlcap but as you figured out by prepending your filter
> service before the kdbclass. That way your filter sits below the kbdclass
> filter.
>
> -Eliyas
>
>
>
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