To anyone who might be interested.
Being unable to find the macro "Resize_A_B_ZZYZX" using
the find function with name contains....
even with "visible and invisible",
I researched keyboard shortcuts and found the shortcut
for Open Library part=command+option+'O' (not command+shift+'O')
I decided that I would trick AC into revealing where "Resize_A_B_ZZYZX"
was kept.
I highlighted the name of the macro in the 2D script hit
command+option+'O' and the macro opened.
I "Saved As" (identical name) in a different folder in the loaded libraries
closed the file, closed the project, and quit.
I launched AC 8.1 opened a project and "Library manager" states that
there are two duplicate library parts (of course).
Library manager says that there is a library part named "Resize_A_B_ZZYZX" in a folder called Archicadresources lib..
Get info says that "Archicadresources" is a shared library resource.
not a folder, not openable, etc.
Mystery solved.
As to what it is, It is a library part that creates 2D and 3D editable
hotspots at the 2D and 3D bounding box corners as defined by A,B,ZZYZX
parameters.
It might be useful for getting 3D editing to work more reliably and/or
much more ???.
For what its worth,
Peter Devlin