Some Windowspackages are virtual unit drivers These programs interface using the Windows Virtual Machine Supervisor. There is a virtual device driver for each principal hardware unit from the product, like the difficult disk generate controller, keyboard, and serial and parallel ports. They are employed to maintain the position of the hardware system which has changeable configurations. Virtual unit motorists handle software package interrupts from the product rather than hardware interrupts.
In Windowsworking operating systems, a device driver file usually has a file title suffix of DLL or EXE. A virtual system driver commonly has the suffix of VXD.
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