Hi David,
You may be able to tell by looking in the Model Panel (open from Favorites menu) after restoring your session.  It should be showing whatever it was showing originally, which often includes things like PDB IDs and/or filenames.
I hope this helps,
Elaine
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Elaine C. Meng, Ph.D.                       
UCSF Chimera(X) team
Department of Pharmaceutical Chemistry
University of California, San Francisco

> On Oct 18, 2018, at 9:33 PM, David Sáez <davidsaez@udec.cl> wrote:
>
> Hello everyone.
>
> I saved some sessions time ago. Now I found the .py files, and they work fine, but I do not remember what files I am opening when I restore the session.
> In the .py file I could not find any information about loaded topologies or  pdb files. Can these data be recovered from a session?
>
> Thanks in advance