data dictionary

hi experts,i'm murali plz solve my doubts

1. can we create a z table with out a 'data emement'is it possible then how plz explain me with the steps plz?

2.in a 'DATA CLASS' we have appl0, appl1, appl2, how can we confirm that whether we have to give appl0, appl1, appl2? plz any one explain me on this?

3. wat's a client dependent table, and client independent tables can any one plz explain me with some examples?