Linked_Portal_Door
I doubt that there is a way they can move. Just like normal portals cant move. I guess we all know that in the neurotoxin room they faked it somehow.
Although we should check how they did that and maybe we could use it in some puzzles (the fake way).
There is a cvar that allows Portals to move, so it really doesn't work the same way. I'm actually curious what the side effects of moving portals are. I wonder if the "fake" physics calculations are left behind, and that's why it 1.) only does it once and 2.) you are nowhere near the portal when it happens.
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For me it looked like the portals that are moving aren't actual portals but like some kind of texture and that's why they are so far away, at that distance the parallax is much smaller. Also the laser looked thicker inside the portal than the one coming out, so it looked like a low resolution texture...
I might be completely wrong though 
I don't know the actual name of the map to check it out now (I don't have the time to load one by one until i find it).
I might be completely wrong though I don't know the actual name of the map to check it out now (I don't have the time to load one by one until i find it).
They are proper moving portals but they get buggy when doing physics calculations so being used at such a distance is the only way. They suck the player in and occasionally fling you out with a large amount of force randomly.
Ok so a was completely wrong
So actually the only purpose of those portals would be to get the laser through.. maybe a bridge???
It's good to know.. They can actually be used in a cleverly set puzzle.
Back on the linked_portal_door... It would be great if they could move. It would make the source engine much more dynamic. Rooms that aren't actually moving but look like they are.. All sorts of things... But I think that, if there is a way to move it, it would cause the same problems as with the moving portals... So they are pretty much just for a scenario like the one with the turrets room in the game or for these crazy big-room-in-a-small-one cases.
That's correct, you can actually shoot a portal through the linked_portal_door before the test chamber moves entirely into place.
First successful LPD test! Yay!
Interesting note: The size entries in the LPD properties do not match the units reported in the UI. The LPD size appears to need to be half that of what the selection and brush tools report.
Room That Contains A Bigger Room (Tardis-test)
(edit: url has been friendlyized)
(how the heck do I give friendly names to urls?)
It's how you use the URL tag. Click "quote" to see the difference here:
http://forums.thinking.withportals.com/downloads.php?view=detail&df_id=420
vs
some text
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Now, please forgive my ignorance of the subject... 
But would it be possible to shoot a world portal (think a sphere) with the gun?
No.