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 The Vxd was superseded by the Windows Driver Model (WDM) and is now obsolete.
A telephone company (telco) provides telephone and data communication services. Most telephone companies offer Internet/telephone packages for a fixed monthly fee. Bundled telephony services are usually cheaper than individual services.This term is also known as telecommunications operator, communications service provider (CSP) and, in the U.S., local exchange carrier (LEC).
Customers use telco services for local, long distance and international phone calls. Fees for long distance and international calls are usually higher than local calls. Additionally, fees are usually charged for phone line rentals. There are also services with discounts for certain call types, including local, long distance and international calls.
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