Remember that every named field in your panel corresponds to a variable in the driver code.
So, suppose your panel has a field named FOO. If a Rexx driver script contains
foo = "BAR"
address ispexec "DISPLAY PANEL(P1)"
then the panel will be displayed with "BAR" in field FOO.
"You have sat too long for any good you have been doing lately ... Depart, I say; and let us have done with you. In the name of God, go!" -- what I say to a junior programmer at least once a day