Determining Tables on Double Click Event on Split Screen

Hi,

I have an OO split screen scenario where I display 2 different internal tables, 1 in the upper section of the split screen and the other in the lower section part. The layout structure used is the same for both internal tables since they display similar information. I am trying to establish that if I use the double click event to drill into specific line items, how do I determine which one of the split screens (and hence which internal table) have I double clicked on so that the correct internal tables details is read for further processing?

Thanks