Why do we need to code loop statement in both PBO and PAI in Table control

Hi friends,
i have 2 questions-
Q1-why do we need to code a loop and endloop statement in both PBO and PAI in Table control,sometimes even empty as well?
Q2-what r d dynpro keywords?

Hi,
It is required to pass information from internal table to table control so we loop it in PBO and to get the updated information back, we loop in PAI and update internal table content.
To get more knowledge on Table controls check these threads -
table control
Table Control
Hope this helps.
ashish

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Why do we need to code loop statement in both PBO and PAI in Table control

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