Is there a system way to automatically invoke a program or Procedure

I am writing some Unit-Test software for our shop, and would like to do
something in an automated fashion when the screen format is opened.  Or
when the user presses a function key.  I am trying to write these
Unit-Test programs with the most minimal code and logic.  So I am
looking for a "codeless" solution inside the RPG program.

A function of "ADDDSPTRG" similar to ADDPFTRG would be great.

One option is to overriding the PRINT function with a program (which I
believe can be done and may be the most straight-forward).

Using a data queue to ultimately hand the Open event back to the display
program seems like overkill to me.

Are there any other alternatives that anyone can think of?


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