regarding table control?

hi this is kumar please clarify my doubt in table control

1. hw to take care of screen resolution while working with table control i.e..some system may have the GUI setting as 15 lines while some other system may have 10 lines per screen so hw to set n take care of this issue please clarify this doubt it important

2.wht is transactional data? hw to do bdc fr tansactional data?if anybody is having sample programe regarding this transactional data bdc, please send it to me.