I know how to get the primary page of the previous stack frame by using the Public API like this:

ClipboardPage primary = tools.getStackFrame().getPRevious().getPrimaryPage();

But is it also possible to get other clipboard top level pages from the previous stack frames?   

For example if a skill was added in an activity or a function it would not be part of the primary page.  How would I examine the newAssignPage data from an earlier frame?

Is there a way to save or access the state of the entire clipboard?

Any help is greatly appreciated.