Oops,

I copied some errant code for the Python Script.  Here's the correct one:

import poser

ArgList = 0

try:
 Args = poser.Scene().ActorByInternalName("GROUND")# Get Ground Actor 
  if Args.Name().startswith("PYT"):   # Parse if it starts with PYT prefix
       ArgList = Args.Name().split("_") # Split argument params
       ArgList.remove("PYT")   # Remove the dummy prefix from the ArgList
       Args.SetName("GROUND")   # Rename the Ground actor back to its original Name
   
except:
      pass       # No ground actor object found in scene

Begin normal program processing

if ArgList:
      print ArgList