I'm new to Node.js and I have been reading about Narwhal that is a framework based on Rhino. My questions: If I'm using Node.js, could I use Narwhal and its libraries/modules? Aren't the libraries/modules in Narwhal I/O-blocked (why Node.js got this huge popularity)? Is Node.js only for creating Web servers or is it for creating general applications, just like Narwhal?

Differences between Narwhal and Node.js

I'm new to Node.js and I have been reading about Narwhal that is a framework based on Rhino.

My questions:

If I'm using Node.js, could I use Narwhal and its libraries/modules?
Aren't the libraries/modules in Narwhal I/O-blocked (why Node.js got this huge popularity)?
Is Node.js only for creating Web servers or is it for creating general applications, just like Narwhal?