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Jake,

I - Calling from a different program.
What is often done is cutting out the 
     D PROTO_02        PR                  EXTPGM('PROTO_02')
     D  num1                         15P 5
     D  num2                         15P 5
and putting that into a seperate source member.  Like QPROTOSRC,PROTO_02. 
And in the PROTO_02 program replace what you cut out with
      /include QPROTOSRC(PROTO_02)
Now, in the new program that you wrote, that you want to call PROTO_02 you 
also include this:
      /include QPROTOSRC(PROTO_02)
     D nbr1            s             15p 5
     D nbr2            s                   like(nbr1)
then, in your calcs you do a simple
/free
  callp PROTO_02(nbr1:nbr2);
or simply the implied callp
  PROTO_02(nbr1:nbr2);


II - Subroutine
You meant subprocedure.  They are different from a subroutine.  See if you 
understand this simple program named JAKE, compiled, tested.
     h dftactgrp(*no) actgrp(*caller)
     D Jake            PR                  EXTPGM('JAKE')
     D  Input1                       15p 5
     D  Input2                       15p 5

     D Jake            PI
     D  Input1                       15p 5
     D  Input2                       15p 5

     D MyCalc          PR             5i 0
     D  SomeNbr1                      7p 2 const
     D  SomeNbr2                      7p 2 const

     D DsplyVar        s              5i 0

      /free
       *inlr=*on;
       // Take the parameters sent to this program, use a simple
       // subprocedure to add them together and display the result.
       DsplyVar=MyCalc(Input1:Input2);
       dsply DsplyVar;
      /end-free

     P MyCalc          B
     D MyCalc          PI             5i 0
     D  ThisNbr1                      7p 2 const
     D  ThisNbr2                      7p 2 const
      /free
       return ThisNbr1 + ThisNbr2;
      /end-free
     P MyCalc          E 

DSPJOBLOG
CALL PGM(JAKE) PARM(X'000000000100000F' X'000000000200000F')
DSPLY      3 

Rob Berendt

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