Poptop server specific configuration

Welcome. I installed poptop server version 1.3.4 on Ubuntu 10.10 with kernel 2.6.35-24-generic.My vpn clients use Windows Xp or Windows 200 to connect with my server. I want make two groups of vpn clients (admins and others).Admins can see all vpn clients from admins and others group but clients from others group shouldn't see another clients from their group but shuld see clients from admins group.Is it possible to block some range of port between clients (generaly i want to block view shared files and printers over vpn) at server ? When client connects software compression not work.How use software compression with clients they use Windows Xp/2000 ? Thanks for reply.

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