You took that code from this thread (which has exactly the same name): asynchronous socket comunication with perl tk
In that thread, the request was for: "... an example of asynchronous socket communication happening through a perl tk application. A very simple and primitive one."
When I wrote that code last month, I included links to related documentation.
If you follow those links, particularly the ones to sections of perlipc, you'll find examples of more complex socket I/O (including multiple clients).
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