Microsoft Dynamics AX licence : Business Essentials vs Advanced Management Users

I learn that there are two types of Microsoft Dynamics AX Licence : Business Essentials vs Advanced Management Users.

Question :

1. What are the differences between Business Essentials vs Advanced Management Users ? What are the additional modules in the Advanced Management Users ?

2. Does Advanced Management Users include additional modules such as Intercompany, AX Retail Headquarter ? Since April 2012, AX Retail Headquarter should be included in AX 2009.

3. In AX 2009, which menu path that I may verify the licence whether it is Business Essentials or Advanced Management Users ?

Thank you.