3.2.42. QUEUED()

Returns the number of lines currently in the external data queue
(the “stack”). Note that the stack is a concept external to REXX,
this function may depend on the implementation and system Consult
the system specific documentation for more information.

     QUEUED()  –>   ‘0’  /* Maybe */
     QUEUED()  –>   ‘42’  /* Maybe */


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