The second component runs in kernel mode and has access to the core operating system data. The first component runs in user mode and presents the user interface. You can do that by splitting the tool into two components. For example, suppose you need to write a tool that has access to core operating system data structures, which can be accessed only by code running in kernel mode. Our expanded definition is reasonably accurate but is still incomplete because some drivers are not associated with any hardware device at all. In this context a driver program is just a program that uses the class or algorithm that you’re developing. They usually provide the interrupt handling required for any necessary asynchronous time-dependent hardware interface. … Drivers are hardware dependent and operating-system-specific. In computing, a device driver is a computer program that operates or controls a particular type of device that is attached to a computer.
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