View full size image. Measured by surface area, the Caspian Sea is the world's largest inland water body. The sea covers roughly 143,200 square miles (371,000 square kilometers) and borders five countries: Iran, Russia, Kazakhstan, Turkmenistan and Azerbaijan.
A logical device driver is a high level abstraction of how a device behaves. A physical device driver is a driver for a specific piece of hardware. The logical device driver talks to the physical device driver for you to keep you abstracted from the underlying hardware. For example, there are many different types of printers, and they typically come with their own drivers.
The driver functions contain the device-specific code needed to carry out actions on the device. Device drivers for Windows Server 2003 are usually library files with .sys filename extensions. Windows Server 2003 installs and configures device drivers automatically. This saves you from needing to allocate resources manually or check for conflicts in devices. Windows Server 2003 checks for a digital signature during device driver installation and issues a message if the driver is not signed.