13.3 Understanding Types of Queues
  Batch and print queues can be divided into two general
  classes:

  An execution and generic queue can be classified as either a
  batch or output queue. The following sections provide more
  details about execution and generic queues.

  13.3.1 Batch Execution Queues
  A batch execution queue can accept only batch jobs. A batch
  job executes as a detached process that sequentially runs one
  or more command procedures. The user defines the list of
  command procedures when submitting the job.

  13.3.2 Output Execution Queues
  An output execution queue accepts jobs for processing by a
  symbiont. The queue manager sends the symbiont a list of
  files, which the user defines when submitting the job. An out-
  put symbiont transfers data from a disk to an output device.
  As the symbiont processes each file, it produces output for the
  device it controls, such as a printer or a terminal.

  The standard print symbiont provided by the operating sys-
  tem is named PRTSMB and is designed to print files on
  hardcopy devices. The LAT print symbiont LATSYM is
  used to print files on output devices attached to LAT ports.
  User-modified or user-written symbionts can also be de-
  signed for this or any other file processing activity managed
  by the OpenVMS batch and print queuing system. (See the
  OpenVMS Utility Routines Manual for more information.)
  Output execution queues include the following types:

  When you create an output execution queue, you designate it
  as either a printer, a terminal, or a server execution queue;
  you can also specify the symbiont to be associated with the
  queue. However, when the queue is started, the symbiont
  process associated with the queue can override the queue
  designation if the queue type specified does not match the
  type of device. The standard symbiont provided with the op-
  erating system determines whether it is controlling a printer
  or a terminal. It communicates this information to the queue
  manager and, if necessary, the queue manager changes the
  type designation of the output execution queue. By conven-
  tion, a user-written or user-modified symbiont that does not
  deliver output to a printer defines its queue as a server queue.

  13.3.3 Generic Batch Queues
  A generic batch queue can direct jobs only to batch ex-
  ecution queues. Generic batch queues are typically used
  in VMScluster environments to distribute the batch work
  load across several nodes (see Section 13.5.3). Generic batch
  queues are not automatically stopped when a node shuts
  down and therefore, do not need to be started when a node
  reboots.

  13.3.4 Generic Output Queues
  A generic output queue can direct jobs to any of the
  three types of output execution queues: print, terminal, or
  server. Generic output queues are typically used to dis-
  tribute the output work load among several like printers (see
  Section 13.6.5).

  Generic output queues are not automatically stopped when
  a node shuts down and therefore, do not need to be started
  when a node reboots.

  13.3.4.1 Logical Queues
  A logical queue is a special type of generic output queue
  that transfers jobs to another output execution queue. You
  might use this kind of queue to temporarily redirect a queue
  when the device on which it runs is broken.

  A logical queue transfers its jobs into the execution queue
  specified with the ASSIGN/QUEUE command. For informa-
  tion on setting up a logical queue, see Section 13.9.1.14.