>>-QUEUE--+------------+--;------------------------------------>< '-expression-'
QUEUE appends the string resulting from expression to the tail of the external data queue. That is, it is added FIFO (First In, First Out).
If you do not specify expression, a null string is queued.
Example:
a='Toft'
queue a 2 /* Enqueues "Toft 2" */
queue /* Enqueues a null line behind the last */
The QUEUED built-in function (described on page ***) returns the number of lines currently in the external data queue.