The Frame object represents a structural model within Multiframe.  It encapsulates all of the objects representing components of the model such as nodes, elements and restraints, load cases and loads applied to the frame, and objects containing the results of any analyses performed on the frame.

This object can be accessed using the Frame property of the Application object, for example:

Dim objFrame as Multiframe.Frame
…
Set objFrame = mfApp.Frame

The Frame object also contains the methods for Opening, Closing and Saving the frame to disk.