How can I populate main screen fields accdng to value frm subscreen field?

Hi All,

I need to populate some main screen fields according to values obtained from a subscreen drop-down field.<b>I require to do this without any 'ENTER' or 'SAVE' triggers of main screen</b>.That is,once a value is selected from the subscreen drop-down field ,some of the main screen fields should get populated.the The subscreen is called from the main screen PBO using 'CALL SCREEN'.Can anyone help me in this.

Thanks in advance,

Anjaly