Hi,
Please stop shouting in your titles; please stop posting basic & vague questions that appear to be interview questions; please read the rules of engagement here
Additionally, you have posted a series of basic and vague questions that exhibit no evidence of you trying to help yourself by searching, reading help or just trying some code. Most of your posts are "I want to do some vague thing, someone tell me how" in style. That isn't what SCN and specifically the ABAP spaces here are for.
Please consider this as initial polite guidance on how to engage here on SCN, and in future think about your posts.
Cheers,
G.