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### Direct Messaging
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All communication over Matrix happens within a room. It is sometimes
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desirable to offer users the concept of speaking directly to one
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particular person. This module defines a way of marking certain rooms as
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'direct chats' with a given person. This does not restrict the chat to
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being between exactly two people since this would preclude the presence
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of automated 'bot' users or even a 'personal assistant' who is able to
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answer direct messages on behalf of the user in their absence.
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A room may not necessarily be considered 'direct' by all members of the
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room, but a signalling mechanism exists to propagate the information of
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whether a chat is 'direct' to an invitee.
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#### Events
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{{% event event="m.direct" %}}
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#### Client behaviour
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To start a direct chat with another user, the inviting user's client
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should set the `is_direct` flag to [`/createRoom`](/client-server-api/#post_matrixclientv3createroom). The client should do this
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whenever the flow the user has followed is one where their intention is
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to speak directly with another person, as opposed to bringing that
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person in to a shared room. For example, clicking on 'Start Chat' beside
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a person's profile picture would imply the `is_direct` flag should be
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set.
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The invitee's client may use the `is_direct` flag in the
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[m.room.member](#mroommember) event to automatically mark the room as a direct chat
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but this is not required: it may for example, prompt the user, or ignore
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the flag altogether.
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Both the inviting client and the invitee's client should record the fact
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that the room is a direct chat by storing an `m.direct` event in the
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account data using [`/user/<user_id>/account_data/<type>`](/client-server-api/#put_matrixclientv3useruseridaccount_datatype).
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#### Server behaviour
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When the `is_direct` flag is given to [`/createRoom`](/client-server-api/#post_matrixclientv3createroom), the home server must set the
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`is_direct` flag in the invite member event for any users invited in the
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[`/createRoom`](/client-server-api/#post_matrixclientv3createroom) call.
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