- WHQL Testing
Windows Hardware Quality Labs testing or WHQL Testing is a testing process which involves running a series of tests on third-party (i.e. non-Microsoft) hardware or software, and then submitting the log files from these tests to
Microsoftfor review. The procedure may also include Microsoft running their own tests on a wide range of equipment, like different hardware and different Microsoft Windowseditions.
New since June 2007 is the requirement of a [http://www.microsoft.com/whdc/whql/audiofidelity.mspx Fidelity Test] equipment (Audio Precision SYS-2722-A-M) for System Submissions.
Products that pass the WHQL tests get to use a "Certified for Windows" logotype, which certifies that the hardware or software has had some share of testing by Microsoft to ensure compatibility. The actual logo used depends on the version of Windows.
device drivers passing the WHQL tests, Microsoft creates a digitally signed certification file that, when included in the driver installation package allows installation on 64 bit versions of Windows Vistaand prevents 32 bit versions of Vista, and all versions of Windows XPfrom displaying a warning message that the driver has not been certified by Microsoft. However, a company can choose to sign their own drivers rather than go through the WHQL testing process. These drivers would not qualify for the "Certified for Windows" logos, but they would install on 64 bit versions of Vista and install without a warning message on 32 bit versions of Vista and XP. [cite web
title=Digital Signatures for Kernel Modules on Systems Running Windows Vista
July 27 2007
Some device drivers that have passed the WHQL tests are also made available for download using
* [http://www.microsoft.com/whdc/whql/ WHQL Testing - overview]
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