Hi Petr,
if I understand the concepts of MNet (AKA Moodle Network - see MDL-16762 for the terminology issue) correctly, you will want to collect all users account information into the HUB server and then let your users roam into connected Moodle peers.
Moodle networking (MNet)
HUB as entry point
ការពិភាក្សាត្រូវបានបិទ ដូច្នេះអ្នកមិនអាចឆ្លើយតបទៀតទេ។