Alientech Kess & K-Tag Questions

Hi to all friends!

Please Sorry if I am posting in wrong section.
I have a question for Kess V2 and K-Tag.

What do I need K-Tag for?
What do I need Kess V2 for?

Can I turn Immo OFF for EDC 17 with Kess V2?
May I read ECUs EDC15 and EDC16 by Kess V2?

Thank you very much!