Yes, PN has support for code hinting although very limited. For example, I know for a fact that for C/C++ and Java, it gives you hints of functions you have in the *same* file you’re working with.
There are also these API files you can create to provide you full code hinting support. PN ships with such API files for PHP and Ruby. You can read these API files in your “schemes” directory to see how they are constructed.