Update README

audio/sysvad/README.md

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-topic: sample
+page_type: sample
 description: "The Microsoft SysVAD Virtual Audio Device Driver (SYSVAD) shows how to develop a WDM audio driver that exposes support for multiple audio devices."
 languages:
 - cpp

avstream/avscamera/README.md

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-topic: sample
+page_type: sample
 description: "Provides a pin-centric AVStream capture driver for a simulated front and back camera that performs simulated captures."
 urlFragment: avscamera
 languages:

avstream/avscamera/mft0/README.md

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 ---
-topic: sample
+page_type: sample
 description: "Provides a pin-centric AVStream capture driver for a simulated front and back camera that performs simulated captures."
 languages:
 - cpp

avstream/avshws/README.md

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 ---
-topic: sample
+page_type: sample
 description: "A simulated hardware sample driver providing a pin-centric capture driver to simulate AV capture hardware."
 languages:
 - cpp

avstream/avssamp/README.md

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 ---
-topic: sample
+page_type: sample
 description: "An AVStream filter-centric simulated capture sample driver with functional audio."
 languages:
 - cpp

avstream/sampledevicemft/README.md

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 ---
-topic: sample
+page_type: sample
 description: "A driver device transform which loads in a process streaming an Avstream based camera device using Media Foundation."
 languages:
 - cpp

avstream/samplemft0/README.md

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 ---
-topic: sample
+page_type: sample
 description: "A driver MFT for use with a camera's Windows device app."
 languages:
 - cpp

biometrics/README.md

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-topic: sample
+page_type: sample
 description: "Contains the Windows Biometric Driver Interface sample and the Windows Biometric Service Adapter samples."
 languages:
 - cpp

bluetooth/bthecho/bthsrv/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates development of Bluetooth L2CAP profile drivers using the Bluetooth L2CAP DDIs."
 languages:
 - cpp

bluetooth/serialhcibus/README.md

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 ---
-topic: sample
+page_type: sample
 description: "Demonstrates how to implement a basic bus driver to support the new Bluetooth Extensibility transport DDIs over the UART transport."
 languages:
 - cpp

filesys/cdfs/README.md

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 ---
-topic: sample
+page_type: sample
 description: "The CD-ROM file system driver (CDFS) sample is a file system driver for removable media."
 languages:
 - cpp

filesys/fastfat/README.md

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 ---
-topic: sample
+page_type: sample
 description: "A file system driver based on the Windows inbox FastFAT file system used as a model for new file systems."
 languages:
 - cpp

filesys/miniFilter/MetadataManager/README.md

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-topic: sample
+page_type: sample
 description:  "An example of how to use files for storing metadata that corresponds to minifilters."
 languages:
 - cpp

filesys/miniFilter/NameChanger/README.md

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-topic: sample
+page_type: sample
 description: "Grafts a directory from one part of a volume's namespace to another part using a mapping."
 languages:
 - cpp

filesys/miniFilter/avscan/README.md

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-topic: sample
+page_type: sample
 description: "This filter is a transaction-aware file scanner that examines data in files."
 languages:
 - cpp

filesys/miniFilter/cancelSafe/README.md

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-topic: sample
+page_type: sample
 description: "A minifilter demonstrating the use of cancel-safe queues."
 languages:
 - cpp

filesys/miniFilter/cdo/README.md

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-topic: sample
+page_type: sample
 description: "An example of using a control device object (CDO) with a minifilter."
 languages:
 - cpp

filesys/miniFilter/change/README.md

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-topic: sample
+page_type: sample
 description: "A transaction-aware filter that monitors file changes in real time."
 languages:
 - cpp

filesys/miniFilter/ctx/README.md

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 ---
-topic: sample
+page_type: sample
 description: "Demonstrates how to attach contexts to instances, files, streams, and stream handles in your minifilter."
 languages:
 - cpp

filesys/miniFilter/delete/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates how to detect deletions of files or streams."
 languages:
 - cpp

filesys/miniFilter/minispy/README.md

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-topic: sample
+page_type: sample
 description: "A tool to monitor and log any I/O and transaction activity that occurs in the system."
 languages:
 - cpp

filesys/miniFilter/nullFilter/README.md

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-topic: sample
+page_type: sample
 description: "A minifilter that demonstrates registration with the filter manager."
 languages:
 - cpp

filesys/miniFilter/passThrough/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates how to specify callback functions for different types of I/O requests."
 languages:
 - cpp

filesys/miniFilter/scanner/README.md

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-topic: sample
+page_type: sample
 description: "A file data scanner example. Typically, anti-virus filters are of this type."
 languages:
 - cpp

filesys/miniFilter/simrep/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates how a file system filter can simulate file-system like reparse-point behavior to redirect a file open to an alternate path."
 languages:
 - cpp

filesys/miniFilter/swapBuffers/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates how to switch buffers between reads and writes of data. This technique is particularly useful for encryption filters."
 languages:
 - cpp

general/DCHU/README.md

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-topic: sample
+page_type: sample
 description: "Illustrates DCHU principles of universal driver design."
 languages:
 - cpp

general/PLX9x5x/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates how to write a driver for a generic PCI device using Windows Driver Frameworks (WDF)."
 languages:
 - cpp

general/SystemDma/wdm/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates how a driver could use a system DMA controller to write data to a hardware location using V3 System DMA."
 languages:
 - cpp

general/cancel/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates the use of the cancel-safe queue routines."
 languages:
 - cpp

general/echo/kmdf/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates how to use a sequential queue to serialize read and write requests presented to the driver."
 languages:
 - cpp

general/echo/umdf/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates how to use UMDF version 1 to write a driver and demonstrates best practices."
 languages:
 - cpp

general/echo/umdf2/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates how to use UMDF 2 to write a driver and to employ best practices."
 languages:
 - cpp

general/echo/umdfSocketEcho/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates how to use UMDF version 1 to write a driver and demonstrates best practices."
 languages:
 - cpp

general/event/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates different ways a kernel-mode driver can notify an application about a hardware event."
 languages:
 - cpp

general/filehistory/README.md

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-topic: sample
+page_type: sample
 description: "A console application that starts the file history service, if it is stopped, and schedules regular backups."
 languages:
 - cpp

general/ioctl/kmdf/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates how to write a non-PnP driver using the Kernel Mode Driver Framework."
 languages:
 - cpp

general/ioctl/wdm/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates usage of four different types of IOCTLs."
 languages:
 - cpp

general/obcallback/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates the use of registered callbacks for process protection."
 languages:
 - cpp

general/pcidrv/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates how to write a KMDF driver for a PCI device."
 languages:
 - cpp

general/perfcounters/kcs/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates the use of the kernel-mode performance library."
 languages:
 - cpp

general/registry/regfltr/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates how to write a registry filter driver."
 languages:
 - cpp

general/toaster/toastDrv/README.md

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-topic: sample
+page_type: sample
 description: "An iterative series of samples that demonstrate KDMF and UDMF1 driver development."
 languages:
 - cpp

general/toaster/toastpkg/README.md

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-topic: sample
+page_type: sample
 description: "Simulates hardware-first and software-first installation of the toaster sample driver."
 languages:
 - cpp

general/toaster/umdf2/README.md

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-topic: sample
+page_type: sample
 description: "An iterative series of samples that demonstrate driver development using UMDF version 2."
 languages:
 - cpp

general/tracing/SystemTraceControl/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates how to use event tracing control APIs to collect events from the system trace provider."
 languages:
 - cpp

general/tracing/evntdrv/README.md

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-topic: sample
+page_type: sample
 description: "Demonstrates the use of the Event Tracing for Windows (ETW) API in a driver."
 languages:
 - cpp

general/tracing/tracedriver/README.md

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-topic: sample
+page_type: sample
 description: "A sample driver instrumented for software tracing."
 languages:
 - cpp