Good afternoon!
As you have noticed "Poka" has several meanings. "Пока" has these meanings:
1. пока что, пока ещё — still, so far;
2. while: надо поговорить с ним, пока он там — we must speak to him while he is there;
3. until, till: звоните, пока не ответят — ring till you get an answer.
4. see you later!, bye-bye!
5. for the present.
If you have any questions - feel free to ask me!
Andrew