The Microsoft(R) Windows(R) Scripting Host is a language-independent scripting host for scripting engines that are Windows Script compatible. The usual two script engines are Microsoft JScript (.js) and VBScript (.vbs), although other script engines are possible. Its function is to make objects and services available to the script, and to provide guidelines/security for running the script. It is capable of running scripts from both the desktop and the command prompt. It is designed for non-interactive tasks, such as logons, administrative tasks, automation, and viruses (not necessarily intentional).
Some of the basic functions it can perform are: The WSH comes built in with Windows 98, Windows 2000, Windows ME, and Internet Explorer 5. It can be downloaded for Windows 95.
Information excavated from the MSDN

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