what does the event OnSentData _exactly_ signal?

Well, there is no such event. You have OnDataSent and OnSendData which are close. OnDataSent: This is when Winsock has accepted all data from TWSocket, that is when TWSocket buffer is emptyed.
OnSendData: This is when TWSocket is able to write data to winsock.

Does it really signal that WinSock has completed sending the data?

There is no such event available. And even if it is, then this doesn't mean anything since the remote side still has to acknowledge it. There could be an event for that, but as far as I know TCP stack doesn't propagate this to the application.

I'd like to encourage those who already have a wiki account but never
wrote anything in it to start helping to document ICS!

+1

--
francois.pie...@overbyte.be
The author of the freeware multi-tier middleware MidWare
The author of the freeware Internet Component Suite (ICS)
http://www.overbyte.be

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