How Server will know when some client Get disconnected

Hi...
I am devloping a chat application.... there are loats of users. and one user can have many friends in his/her list. and showing in two groups as Online And Offline.
How Chat Server will know what is the user's Status(online or offline) When the user will get disconnected due to Internet failure
" Let you are a user having 10 friends, and when you loged in, at that time you have 5 online friends and 5 offline friends. lets after some time one of your online friend get disconnected from server due to any kind of netwrk failuer, then how server will know about it."

When the server tries to write to the socket and verify that it is OK, then it will return an error.

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You can
Create a NEW account using these instructions. Make sure you follow the instructions. Many do not and if you do not you will not get the None option. You must use an email address that you have not used with Apple before.
Creating an iTunes Store, App Store, iBookstore, and Mac App Store account without a credit card
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How Server will know when some client Get disconnected

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