Flow of UEDLL hooks

Hi,

I'm new for LN Programming.... I know that the following hooks are used in UEDLL as follows...

•ue.before.before.save.object()
•ue.after.before.save.object()
•ue.before.after.save.object()
•ue.after.after.save.object()
•ue.before.before.destroy.object()
•ue.after.before.destroy.object()
•ue.before.after.destroy.object()
•ue.after.after.destroy.object()

But I don't the proper idea that when these hooks are triggered properly... So can you please tell me that the execution of the UEDLL hooks in detail with some example script...
Thanks in advance....
Regards,
Pralash