1) is there clients management system available in avast server edition?
Yes, it's called the ADNM console. It's free.
2) How many clients can be manged through 1 server edition license?
One server. no clients. You need netclient licenses for your clients, server licenses for your servers, and SBS Suite licenses if you run on SBS.
The ADNM console can be installed on any computer to access the AMS server (which is usually installed on a dedicated server or one that isn't doing much).
Your license file is added into the AMS mirror using the license tool, then the clients access the mirror for updates. You deploy installations via the ADNM console to the clients and / or servers.
Read the ADNM admin guide manual here:
http://files.avast.com/files/eng/adnmag.pdfFind out more here:
http://www.avast.com/distributed-network-manager#tab1
