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7.3. The interface between REXX and the stack

As defined in TRL, the interface to the stack consists of the
PARSE PULL, PULL, PUSH, and QUEUE instructions; and the QUEUED()
built-in function.

There exists a binary interface to the stack in SAA, see the
chapter on the SAA API interface. This interface consists of the
RXMSQ exit handler  and the QUENAME value of the RXSHV_PRIV
request of the RexxVariablePool() function of the variable pool