I've set up Node.js and Nginx on my server. Now I want to use it, but, before I start there are 2 questions:

1. How should they work together? How should I handle the requests?

2. There are 2 concepts for a Node.js server, which one is better:

   a. Create a separate HTTP server for each website that needs it. Then load all JavaScript code at the start of the program, so the code is interpreted once.

   b. Create one single Node.js server which handles all Node.js requests. This reads the requested files and evals their contents. So the files are interpreted on each request, but the server logic is much simpler.

It's not clear for me how to use Node.js correctly.