listening serial port

From: "Mark Albourgh" <malbourgh1@xxxxxxxxx>
Date: Sat, 2 Apr 2005 16:47:09 +0200

Does anyone know a way of listening to serial port?
I know how to read data from it, but only know
to check the port for the data constantly which occupies cpu a lot.
I need this to receive data from a machine.

Thx

.

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