How to refresh a selection screen

hi,

can any one tell me how can i refresh a selection screen?

i mean that the first screen is not a gui screen it is a selection screen.

i.e screen com from

select * into itable from zemp_sh.

write: itable-emp_name, itable-emp_phone,....etc.

and the screen 100 is the screen results from record selected on the selection screen.

at line selection.

call screen 100.

Thanks in advance,

Diwakar.