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Using %%$ORIGIN we can verify if the parameters were added by the user, as shown in the following REXX sample:
Fig.JV.5.3 Example 3 of REXX call
/* REXX */
INIT = CTJRXX("INIT")
S = CTJRXX("SETVAR","%%A = %%$ORIGIN %%$JOBMSGL")
END
RETURN
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