Save saves a Chimera session. If session_name is omitted, a dialog for specifying the name and location will appear. A session file consists of Python code that reconstitutes the state of Chimera by displaying data and performing other operations; if no .py suffix is entered, it will be added to the name automatically.
Molecular coordinate and sequence alignment data are included in the session file; however, volume data files must still be present to restart a session in which they were open. When a session with volume data is restarted, the user may be queried about file location(s) if the data or the session file have been moved since the session was saved.
There are multiple ways to save sessions and restart sessions.
See also: savepos, open, export, write, pdbrun, the File menu