Decision Tree

Hi everyone!
I would like to know the meanning of the input parameters of the deccision tree. They are
1.keep example set
2.criterion.
3. minimal_size_for_split
4. minimal_ leaf_size
5.minimal_gain.
6:minimal_depth
7:confidence
8.number_of_prepruning_alternatives
9.no_pre_pruning
10.no_pruning

Or where i can find these info and the infor of the other parameter for other trees like wj48?

Thanx!!!