Mutiple enhancements in BADI

Hello SDNites,

I have some queries related to BADI implementation,

1. BADI can be implemented mutiple times. But can multiple implementation be active at the same time.

If no, what is the use of saying that BADI can be implemented multiple times.

If yes, how can we do it and how do we know in which order which implementation is triggered. Also if I do not want some implemntations to be called, is there any option other than deactivating the BADI?

If there is some example availble which will help in giving a better insight of the topic, provide the same also.

Abhishek