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| − | ==User Story==
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| − | Chris starts up the IM program. He is prompted to input a unique '''username''' and to '''login'''. When he has '''logged in''' he can see a list of the '''other users online'''. Seeing that Joe is online he starts a '''chat''' by selecting Joe in the online user list and writing a '''message'''. Chris's message appears in a new '''chat'''. Joe responds with a message and it appears in the '''chat''' also. Chris decides to stop chatting and '''exits the chat''', he then '''logs off''' and closes the program.
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| − | ===Behind the Scenes===
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| − | When Chris logs on, the IM client checks the uniqueness of his username with the server (against the list of online users). Chris' username is unique so he is logged on and added to the online list. Chris' client is then updated with the current list of online users so that Chris can see them. When Chris starts a chat with Joe the client registers the chat with the server and passes the message. When Joe replies the server passes the message to Chris' client so that it can be added to the chat
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| − | ==Notes==
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| − | *There are '''users, chats and messages'''
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| − | *'''Users:'''
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| − | **Users have unique '''usernames'''
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| − | **Users can ''''login/logout''' and have '''state (logged in/out)'''
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| − | **Users can be invited to or leave '''chats'''
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| − | **Users can write a '''message''' to a '''chat'''
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| − | *'''Chats:'''
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| − | **'''Chats''' are started by a '''user''' by '''sending messages''' to a '''user'''
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| − | **'''Chats''' have a history of '''messages'''
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