[ns] send() funtction in tcp.cc

[Tatiana Polishchuk]

Hi, I'm trying to understand the logic of tcp agent code. In the tcp.cc
there is a function output() which sends tcp packets.
It uses send (p, 0) function inside. Could anybody explain where the
function send is defined? Can't find it in the included files.. Is it
standard networking send? If yes, why it has no parameters like source and
destination?