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2.4.18 The QUEUE Instruction
      QUEUE [ expr ] ;

The QUEUE instruction is identical to the PUSH instruction, except
for the position in the stack where the new line is inserted.
While the PUSH puts the line on the “top” of the stack, the QUEUE
instruction inserts it at the bottom of the stack (FIFO), or in
the bottom of the topmost buffer, if buffers are used.

For further information, refer to documentation for the PUSH
instruction, and see chapter Stack for general information about
the stack.



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