The Exists method returns a Boolean value. It returns true if the requested argument was specified on the command line (otherwise, it returns false).

Consider the following information typed at the command line.

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myScript.vbs /c:"WSH is a wonderful thing"

You could use these two lines of JScript code to find out whether the following command line switches were used to start the script.

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WScript.Echo(WScript.Arguments.Named.Exists("C")); WScript.Echo(WScript.Arguments.Named.Exists("D"));

Reference