Overlay with 2 display files used by 2 different pgms

hi

I have a Prg which does an EXFMT and based on some condition I call another 
program which does an EXFMT of another display file .However , I want the 
second display file to overlay on the first with out erasing 
anything..........

Presently , when the second prg is called , the first screen is erased  
fully.though I am using the overlay keyword.

I got the result i wanted when i used only one rpg program and only one 
display file , with overlay keyword.

But somehow, Iam not getting the result when iam using 2 prg and 2 files

I tried using , KEEP keyword and RSTDSP(*YES) , but i cd not get result

can anybody throw light on it

regards

nan
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