If your file to include is in a subfolder of the folder with your active.jsx file, you add this as the first line of active.jsx file:
Thomas B. Nielsen
Q1) Can it be external file like:
Q2) If the file is in parent folder instead of current folder, is following fine?
It's not "target", but "include"; and you need to add the quotes as well.
Besides these two minor points, I think all it can use is a "Fully Qualified Filename". "../file.jsx" is a valid FQF, "../bla.*" is not. Your TCP/IP example is malformed -- it should be something like "http://18.104.22.168/file.jsx" -- but really, there are only a few libraries that include any and all external protocols to their path operations. You can try, but personally I'd bet it can only work with really existing files on a really existing hard drive.