PROGRESS 4GL - Input from external procedure

[Wiktor]

I need to update field in program a.p using external program or procedure. But i can't. This is example of a.p:

DEF VAR v1 AS CHAR.
DEF VAR v2 AS CHAR.
DEF VAR v3 AS CHAR.
DEF VAR v4 AS CHAR.

DEF VAR external_program AS CHAR INITIAL 'myexternalprogram.p'.

FORM
v1
v2
v3
v4
WITH FRAME f1.


ON F2 OF v1 IN FRAME f1
DO:

RUN VALUE(external_program) .

END.
REPEAT:
UPDATE
v1
v2
v3
v4
WITH FRAME f1.
END.
=========================================
myexternalprogram.p :

INPUT FROM VALUE(txt_with_data).


If i am using internal procedure is very easy. But i need to use external. And i cannot modify program a.p . I tried some with handle but i failed...

I started thinking , is it possible in any way?

Thank You for Your answer.

When I use :

MESSAGE PROGRAM-NAME(2) VIEW-AS ALERT-BOX.
MESSAGE SELF:NAME VIEW-AS ALERT-BOX.

SELF:SCREEN-VALUE = 'w1'.
APPLY "ENTER" TO SELF.


I can jump to another field, but on the end of the procedure. How can I with similiar code jumping through all of my fields knowing frame and field name?

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