A virtual device driver (VxD) is a software device driver that emulates hardware and other devices so that multiple applications running in protected mode can access hardware interrupt channels, hardware resources and memory without causing conflicts. The Vxd was superseded by the Windows Driver Model (WDM) and is now obsolete.
IT service management (ITSM) is the process of aligning enterprise IT services with business and a primary focus on the delivery of best services to end user.
IT service management deals with how IT resources and business practices in together, are delivered in such a way that the end-user experience the most desired result from the accessed IT resource, application, business process or an entire solution stack.
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