Yes, I read at least 3/4 of the VPN primer and watched more than a dozen videos of youtube but am still struggling to "get" the big picture, so to speak. I've just upgraded from BI4, which I've had for a few years, to BI5 and just finished installing DDNS via .iptctddns.com........... So help me out here: the open VPN is used primarily between a phone app(viewer) and the server (standalone PC running BI in my case) so that one doesn't need to port forward, correct? How does this affect the DDNS I just installed into my phone app? Under what other circumstances would I need to, or want to, use the same VPN interface and if not too much trouble, how would I use it (examples please)? As always, Thanks Bob T.