[Tutorial] How to use Hamachi

[noctis]

i want ask about hamachi
if i want play with my friends, i need join a ext network?
and without join ext network, can we play multiplayer just copy ip host?

and i want ask about coldbird
can i play multiplayer in coldbird using zte modem? (because no dmz on modem u.u)
and any ppsspp setting we must change to connect coldbird (ex checklist adhoc or change alternative speed from unlimited to % in graphic setting?
sorry for bad english @.@