reference files

[poda19]

hi
i was wondering is there any reference or help files for other C libraries in the internet? like those references in this site for standard c++ library.
for example explanations about functions in winsock2.h or i don't know any other header files?
if there aren't such references so how do programmers know what functions or classes are in the header files they use?
thanks

[Moschops]

A solid C++ reference is http://en.cppreference.com/w/cpp

winsock is a Microsoft thing; you'll have to check their references for it; similarly for other C++ code that isn't part of the language definition.