Possible?

And what packet would you use to check the opening of portals globally?

You might want to read Timii's post again:

To my knowledge, The client is designed to not pull information from outside of your 30 tile wide circle of sight (left side to right side (15 tiles radius from player))
It's to keep the client from having to use several GBs of ram.

So unless you see the object you can't log it.

Exactly why I said when the portal loads onto your screen. As far as I know, dungeon portals only stay for 30 seconds, so when the portal loads on your screen, set a countdown under the portal for 31 seconds.

It's a troll "hack" that leaves "noobs" confused and angry.

Read this: