Seems neither a reference movie nor a QuickTime Movie Link file will "share" with another iTunes library.

In other words, they will play fine on your local machine, but if you share playlists with another Mac on your network these files will not show up, unfortunately. I have tried mounting all the drives where the original movie files reside on my MacPro, still nothing shows up in the MacBook iTunes shared list from the MacPro. Full video files that are .mov or mp4 show up, just not any reference movies or qtml movie files.

This other hint claims that the qtml method -- provided the source file drives are mounted on the local machine -- will stream the videos. I have not found this to be true. I hope someone can prove me wrong as I would love for this to work.

Also, be forewarned that the qtml files will not reference the original files if you move the original movie files. However, the "reference movie" option will.

My bad, the other hint was not referring to a qtl Media Link file, but rather re-saving the movie with a .mov container.