What are the limitations of NEP?

Hi, I want to know what are the limitations of NEP, I want to display one textbox on card web part which will allow to enter date in it. Main thing is that this textbox will be not attached with any table. Than I have to display one Button on same web part, and by pressing this button I want to fetch some data from table and than want to display it on List web part (another web part with some customized columns (these columns will contain totals of another columns, again this custiomized columns are not stored as field in table) Is it possible to do it in NEP? How to do this ? Naimish Dave Moderator: Cross posting deleted GRRRR [:(!] and title edited.