                                                                                                              
  CONST                                                                                                       
    pfc$connected_file_device = 0,                                                                            
    pfc$interstate_link_device = 1,                                                                           
    pfc$local_queue_device = 2,                                                                               
    pfc$log_device = 3,                                                                                       
    pfc$magnetic_tape_device = 4,                                                                             
    pfc$mass_storage_device = 5,                                                                              
    pfc$memory_resident_device = 6,                                                                           
    pfc$network_device = 7,                                                                                   
    pfc$null_device = 8,                                                                                      
    pfc$pipeline_device = 9,                                                                                  
    pfc$rhfam_device = 10,                                                                                    
    pfc$terminal_device = 11;                                                                                 
