When set "on", this setting causes PyMOL to display all states or in NMR jargon: all the models in the ensemble.
The 'default' behavior (OFF) can be overridden by placing the "set all_states, on" statement into your '.pymolrc' file, located in your login directory (under all flavors of unix).
set all_states, on
set all_states, off
# fetch a PDB and show it in multiple states; this one
# line does the work of the next 6 lines.
fetch 1nmr
# this is older code, use the above code which is newer
import urllib2
pdbCode = '1BRV'
pdbUrl = 'http://www.rcsb.org/pdb/downloadFile.do?fileFormat=pdb&compression=NO&structureId='+pdbCode
pdbFile = urllib2.urlopen(pdbUrl)
pdbContent = pdbFile.read()
cmd.read_pdbstr(pdbContent, pdbCode)
set all_states, on
