multithreading in C++

I know I've been making a lot of threads here lately, but I'm hoping this is the last one. Is there a simple way to multithread in C++? Is there a function which will split the code between threads? or would I have to switch language to do that? I'm using a pentium4 (if it helps).

Multithreading is never simple, just varying degrees of hard. I'd use pthreads since that is what I learned from C, but there should be other multithreading libraries out for C++ if you google it.