Dribbling with other parts of the body, legal?

[mendi]

Hello, long time i didnt ask a question so here it come:

1) Is it legal to dribble with other parts of the body (ofcourse foot not include) ?
2) Is it matter if question 1 is intentional or unintenional?
3) Is it ok if while dribbling, the ball touch the body accidently ?

4)What about the case of regular dribbling end, then released from hands touching the floor, and then jump back touching the body (lets say chest) is it double dribble?