ALV Grid data changed

Hello;

i am using fm REUSE_ALV_GRID (not OO) to display an internal table. The user wants to change the data in a certain cell. I have marked this cell as editable and it works fine. I want to learn what to check in the event of data_changed. I have added this event in table ALV_EVENTS and directed to a subroutine. What parameters should i pass to the subroutine and what should i check to read the relevant line? Is it possible to control changes in more than one line?

Thx

Ali