It seems there is a bit of confusion between activation and transfer function. From Wikipedia ANN:

It seems that the transfer function calculates the net while the activation function the output of the neuron. But on Matlab documentation of an activation function I quote:

satlin(N, FP) is a neural transfer function. Transfer functions calculate a layer's output from its net input.

So who is right? And can you use the term activation function or transfer function interchangeably?