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 The Vxd was superseded by the Windows Driver Model (WDM) and is now obsolete.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 sandbox, in computer security, is a security mechanism in which a seperate, restricted environment is created and in which certain functions are prohibited. A sandbox is often used when untested code or untrusted programs from third-party sources are being used.
A sandbox is most frequently used for testing. In this sense, a sandbox is really nothing more than a test or staging server. The goal is to give enough access to allow proper testing while not exposing critical systems to potentially flawed code. In practice, this can take the form of a separate server or mirrored production enviornment.
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