![]() ![]() ![]() ![]() The user-mode PnP manager tried to perform an automatic install without user input or intervention.When it fails to find one, it tells the user-mode PnP manager about that device using its DIID. The PnP manager checks the registry for a corresponding function driver.A bus driver informs the PnP manager about a device it discovers during enumeration using a device instance identifier (DIID).My information comes courtesy of Mark Russinovich and David Solomon's terrific book Windows Internals (6 th edition in two volumes, as of this writing): For this discussion I'm going to stick to so-called Plug and Play (PnP) devices, which are built to announce themselves to Windows so that it can at least assist in finding a device driver to use, if not find the latest and greatest instance of its kind. Installing a Windows Driver is actually a fascinating process, and involves a lot of behind-the-scenes action in Windows. ![]()
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