sadscript

What is sadscript? Can I use it in vb.net? Why hasn't anyone I have asked heard of it?

The title is my question. Basically, I have heard people speak of it before, I understand it to have something to do with vb6, and I know it lets the user code for the application, but I am unable to determine if it is a separate library or built into vb, and I cannot find documentation for it anywhere. Thanks for the help! ...