Most client programs must look up to the protocol port for the SPECIFIC SERVICE. BSD UNIX getservbyname function takes two arguments: a string specifying the desired service and a string specifying the protocol used.
Wengi mipango mteja lazima kuangalia juu ya bandari itifaki kwa SERVICE MAALUM. BSD UNIX getservbyname kazi inachukua hoja mbili: kamba kubainisha huduma taka na kamba kubainisha itifaki kutumika.