[IDT 4.x] IDT Dimension Keys What and When to use?

Hi,
I am new to IDT tool. What are Dimension/Attributes Keys? When are they good to use?
I understand the Keys in the DLF but not in the Business layer.
Anyone using them?
Thank you,

Hi Campbell,

IDT training videos on youtube should be able to help with you many of your questions.

Thanks,
Mohammed