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Throughout the Harry Potter story, we've seen the Room of Requirement be a number of different things. It can be a place for Dumbledore's Army to practice, or an extremely huge closet filled with uncountable items (including a horcrux), and more.

But can it be two different things at the same time? For instance, could Harry and Dumbledore's Army be using it for practice and, while they're practicing, could Snape use it as the huge closet so he could slip in and hide something? And if it's being two or more things at once, to different people, would they have any way of knowing that while they're in it, someone else is in another "version" of the Room of Requirement?

12

Nope. In the sixth book, prof Trelawney tries entering while Malfoy is already inside.

The Room of Requirement,' repeated Harry. 'Were you try-ing to get in there?'

'I - well - I didn't know students knew about -'

'Not all of them do,' said Harry. 'But what happened? You screamed ... it sounded as though you were hurt...'

'I - well,' said Professor Trelawney, drawing her shawls around her defensively and staring down at him with her vastly magnified eyes. 'I wished to - ah - deposit certain – um - personal items in the Room ...' And she muttered something about 'nasty accusations'.

'Right,' said Harry, glancing down at the sherry bottles. 'But you couldn't get in and hide them?'

He found this very odd; the Room had opened for him, after all, when he had wanted to hide the Half-Blood Prince's book.

'Oh, I got in all right,' said Professor Trelawney, glaring at the wall. 'But there was somebody already in there.'

'Somebody in -? Who?' demanded Harry. 'Who was in there?'

' I have no idea,' said Professor Trelawney, looking slightly taken aback at the urgency in Harry's voice. 'I walked into the Room and I heard a voice, which has never happened before in all my years of hiding - of using the Room, I mean.'

Later on, she says

Everything went pitch black and the next thing I knew, I was being hurled headfirst out of the Room!'

So basically, she tried entering the room when Malfoy was already in it, and thus entered the same room that Malfoy was in.

Another scenario is in the Deathly hallows, where Harry needs to empty the room to search for the diadem:

He knew that the room would not be able to transform while there were still users inside it. .... “Ginny,” said Harry, “I’m sorry, but we need you to leave too. Just for a bit. Then you can come back in.” Ginny looked simply delighted to leave her sanctuary. “And then you can come back in!” he shouted after her as she ran up the steps after Tonks. “You’ve got to come back in!”

  • 8
    While this is a good example, I think it's worth pointing out that they were both going for the same room (of hidden things). – Kevin Feb 8 '12 at 13:39
  • 2
    The first part does not answer the question as Kevin points out; but the second part is correct. – Möoz May 1 '14 at 22:30
  • 2
    That only shows what Harry thought. Might not be true. – ike Sep 7 '14 at 4:32
10

No. When Harry and company needed to get into the Room of Hidden Things to find the diadem, they had to get the remaining occupants out so they could change it.

  • 1
    Also the Trelawney-Malfoy incedent when she tries to go in while Draco is already inside. – Manishearth Feb 8 '12 at 10:48
  • @Manishearth - you should add a separate answer. It's information worth a real answer! – DVK-on-Ahch-To Feb 8 '12 at 12:12
  • @DVK Well, I didn't do that because I wasn't exactly sure of what had happened. Anyways, I checked.. Thanks! – Manishearth Feb 8 '12 at 12:44

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