module pool prgm

Hi all !

I' have a question regarding module pool programming..

I was trying to use leave to screen 0 .

as far as I know it is used to go back previous screen,

but in my program it is leaving program instead of going back to previous screen.

Please someone explain me is "Leave to screen 0" works like 'Leave program'?

if not then how to use it to switch to previous screen?

Thanks ,

Sri