1, the server side how to maintain a list of users already logged on 2, reverse communication, through the server to the client to send the file 3, to achieve client and server-side Chat Chat (little change can be converted to C-> S-> C of the chat program) 4, how to use IdTCPServer and IdTCPClient control 5, a preliminary approach to achieve thread command, when sending the file will not allow the server to stop responding via D7+ Indy Snapshot Demo version to compile, please do not use any Delphi Indy native compilation (including BDS2006, as they bring their own versions of Delphi have Bug)

udp Server SendFile to Client Delphi\Client\Client.dpr
....................................\......\Unit1.dfm
....................................\......\Unit1.pas
....................................\Server\Server.dpr
....................................\......\Unit1.dfm
....................................\......\Unit1.pas
....................................\Client
....................................\Server
udp Server SendFile to Client Delphi

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