Get assembly or part document from the internal name

[pts.user2]

I am having an internal name of a part/assembly fetched from the document.

AssemblyDocument assemblydoc = doc as AssemblyDocument;
string internalName = assemblydoc.InternalName;

I want to know that can I get back this assemblydoc details using the internal name from the inventor active document directly from the root assembly document as I don't want to traverse the complete model to get this details.

[bradeneuropeArthur]

As Long as the program/code is active the Assembly-document is still declared...