Microsoft Script Debugger
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Microsoft Script Debugger is a free lightweight debugger for Windows Script Host-supported scripting languages, such as VBScript and JScript. It offers a minimal but workable user interface that allows the user to step through executiion of script code line by line, and examine values of variables after any step. In effect, it provides a way for developers to see script code behavior as it runs, thus eliminating much of the guess-work, then things don't quite work as intended.
Microsoft considers it to be deprecated in favor of the more sophisticated Microsoft Script Editor (MSE.EXE), an optional tool included in Microsoft Office 2000 and newer versions of Office.[1]
Usage
After installation, new options can be found in Internet Explorer's Script Debugger menu, which gets added in the View menu. Debugging can optionally be turned off from the Advanced tab in the Internet Options dialog.