jsdIStackFrame scope jsParent

A Firebug user just told me about "jsParent". This is a property of 
jsdIValue objects and it turns out that if the jsdIValue object is 
jsdIStackFrame.scope, then the jsParent is a link to the scope chain for 
the function on the stack.

Is there any way to get this scope chain from a jsdIScript object? Its a 
property of the function not the stack correct?

jjb