What is the difference between the Level 7 and Level 15 access. if i configure one user as level 7 access and another as level 15. what are the extra features level 15 user can access.I dont find any commands that will not work for level 7 user.

We have two locations and locationwise two acs servers have been installed.We have kept the servers which are in the location as primary.Everything is working fine. But i want the accounting part should be in both the servers. Dont know ("A" location...