The URL points to the Red Hat bugzilla entry that got me started looking into 
this. 
 
The manual says 
"smbspool tries to get the URI from argv[0].  If  argv[0]  contains  the name  
of the program then it looks in the  DEVICE_URI environment variable." 
 
But source/client/smbspool.c does: 
  if (getenv("DEVICE_URI") != NULL)                                      
    strncpy(uri, getenv("DEVICE_URI"), sizeof(uri) - 1); 
  else if (strncmp(argv[0], "smb://", 6) == 0)           
    strncpy(uri, argv[0], sizeof(uri) - 1); 
 
So the manual should say 
"smbspool expects the URI of the printer to use to be passed in the DEVICE_URI 
environment variable.  If DEVICE_URI is not set in the enviroment, smbspool 
will look in argv[0] (normally the name of the program being run)." 
 
It should also mention "if argv[0] does not start with "smb://", but argv[1] 
does, smbspool assumes it is being called from a broken shell script and 
shifts argv[], forgetting argv[0], and moving all other arguments down one in 
the array." 
 
Of course all of this should be rewritten by someone who can actually write. 
:-)