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  Windows Vista APC Internals: an in depth exploration of Windows asynchronous procedure calls. Do you spend your nights awake wondering how the APC interrupt manages to break into the right thread? Stop loosing your sleep! Read this truth-uncovering article full of juicy details like undocumented thread states. And there's even more: a test driver complete with source code is available to see APCs at work and a PDF version of this article can be downloaded here.

  Windows XP IRP Completion Primer: how to properly complete IRPs and why it has to be done this way. Includes a test driver to explore how you can mess the system up by not properly completing IRPs. Just make sure you have a backup before running it. You can download the PDF version here.