The TFRCTL command can be used to pass parameters to the program being called in the same way the CALL command passes parameters, but with these restrictions:
In the following example, PROGA calls PROGB and passes two variables,
&A and &B, to it. PROGB uses these two variables and another
internally declared variable, &C. When control is transferred to
PROGC, only &A and &B can be passed to PROGC. When PROGC
finishes processing, control is returned to PROGA, where these variables
originated.
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