system
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I have never tried pushing out to separate networks, so take my input with a grain of salt as it is mostly my speculation on it: (And someone please correct me if they know otherwise)
A lot of this question depends on how separate your networks really are. Are they all part of the same domain/active directory forest?
The AEA uses Active Directory to find and organize computers on your network, so if they are on completely separate forests, I believe that would require setting up multiple servers with separate licenses for each site.