You might want to try the fileevent method of tk:
$widget->fileevent(fileHandle,readable?,callback?)

This command is used to create file event handlers. A file event handler is a binding between a filehandle and a callback, such that the callback is evaluated whenever the filehandle becomes readable or writable

In reply to Re: Perl/Tk telnet client - reading server input in an Event Driven environment by Ido
in thread Perl/Tk telnet client - reading server input in an Event Driven environment by JPaul

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