For premium members, when you send an instant message, it will appear on your IM History page with a red notification that it has not been seen yet:

When your recipient looks at the IM, the red notification will disappear. This tells you that your recipient has "seen" the message, but it is no guarantee that he/she has actually "read" it.
Non-premium members do not have this feature.
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by KeysCapt
edited by tmpchaos 
last modified: 2013-09-20 14:01:35