LET Structure

        LET OutStructure% [=] InStructure%

    Assign,  in as much as possible, a structure to another one.  The struc-
    tures do not need to be identical: only matching structure elements  are
    copied.

    In addition, the DATA area of Structures are ignored in this process: if
    needed, they must be copied separately, e.g.
          OutStructure%DATA = InStructure%DATA