Have a look at netsend and netreceive. TCP and UDP ports can be used this way. Have a look in the reference folder in your PD dir.
Cheers
Soeren
Are there any PD modules which would allow to do this already? For example is there a special send/receiev mode or module whih cwill let me call an pplication sn apass arguments to it? ... stream data to a TCP/IP port etc.