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FYI: Steve Johnson has an article about this new lisp function called (inspector), in BLADE, for inspecting objects.

It would help to have more information. What happens in drag&drop depends on what you drag and where you drop it. For instance, if you drop a drawing onto the AutoCAD icon, it opens as its own drawing, whereas if you drop it into your drawing space it becomes a block inside the current drawing. Also, the operating system (and the version of it) you have can affect drag&drop. Have you recently upgraded your OS? What are you attempting to drag? Where are you dropping it? What is the desired outcome?

I'm not sure what sort of steps you're looking for? The procedure is in the name. Just "Drag" and "Drop". But, if you need more information, take a look here: https://knowledge.autodesk.com/support/autocad/learn-explore/caas/simplecontent/content/autocad-triple-d-develop-drag-drop.html

If you are using AutoCAD for Windows you can get the maximum and minimum extents (and hence the maximum and minimum elevations) using the vla-GetBoundingBox function. This works for any entity, not only 3DFaces. I've put up a simple example that displays the Minimum and maximum elevations for the selected object: (defun c:show-elev (/ minpt maxpt) (vl-load-com) (vla-GetBoundingBox (vlax-ename->vla-object (car (entsel "\nSelect entity: "))) 'minpt 'maxpt) (alert (strcat "Minimum elevation:\t" (rtos (last (vlax-safearray->list minpt)) 2 4) "\nMaximum elevation:\t" (rtos (last (vlax-safearray->list maxpt)) 2 4)))) This other one displays the maximum and minimum boundingbox corner: (defun c:show-extents (/ minpt maxpt) (vl-load-com) (vla-GetBoundingBox (vlax-ename->vla-object (car (entsel "\nSelect entity: "))) 'minpt 'maxpt) (alert (strcat "Minimum boundingbox corner:\t" (vl-princ-to-string (vlax-safearray->list minpt)) "\nMaximum boundingbox corner:\t" (vl-princ-to-string (vlax-safearray->list maxpt)))))