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not sure about mac, but on windows you can simply set it up in the autostart. think this could be an equivalent for macs. then in the admin-console set 'minimize at startup', if available on macs:
at system-startup it runs in the background and shows only the icon in the info-tray. at least on windows-systems:
refer also to this (for windows).
Customer support service by UserEcho
you're welcome.