any simple sample code of display filter driver?

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From: netwom (netwom8848_at_yahoo.com)
Date: 08/13/04 

Date: Thu, 12 Aug 2004 23:45:13 -0700

Dear all,

I am very new to this driver stuff. and I am looking for some tutorial on
how to write a display filter driver. Are there any sample code of simple
display filter driver?

Please give me some pointers!

thank you very much