[Tutor] How to monitor streaming data from the internet via modem?

[Ars]

Say I want to monitor the data that comes through my modem when I'm running a trading platform (like for stocks) so I can send an alert when a certain condition has been met like the price of a stock.  

If the trading program is in java or perl, can I just tap into the raw data that trading program is recieving through the modem without interfering with the trading program's own information stream?

-Jack
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