Jihaad and Slaves

Q: First time I am asking you a question so I want to know there is a group named the ISIS. I do really know what that group is about and who they are and what they stand for are Muslims? What is you opinion what are they doing wrong? Please shed some light on this please brother I am writing this from Trinidad and Tobago.

Q: I want to know the concept of kaneez/loundi in Islam. Is this rule still applicable like the previous age? Or that was for the present time? If this practice has been stopped then how? What does the Qur'an say about it?

Q: What are the conditions for a woman to participate in jihaad (battle/war)?