Reading from a Queue

The statement <PULL reads from STDIN if there's no data in the REXX queue. 
Use the function <LINEIN("QUEUE:") to read from a REXX queue and wait for 
the data if the queue is empty. 

(see also Using a queue)  Reading from an invalid queue raises the 
condition FAILURE Therefor you should test a queue before using it 
res=10410008.Using a queue