At work I added many other coworkers' My Music folder into my MC Library. Then I can stream their music home if I want to listen to any of the songs. I also stream from home to work.
I use
No-Ip Free at home to assign a url to my dynamic IP address. For example, I could use jrmc.redirectme.net to point to my home computer. If my ISP every changes my dynamic IP address, the No-Ip software on my computer updates jrmc.redirectme.net to point to the new IP address.
If I have library server running in MC at home, from work I can go to File > Library > Library Manger > Add. I type in jrmc.redirectme.net and I now have access to my home library.
I have used this while on vacation to access my library, too.
When I had MC version 12, I installed Media Jukebox on my Dad's work and home computer and gave him the url of my library. He could then stream my music. I now have MC 13 and Media Jukebox hasn't been updated to work with its library (as far as I know). Maybe I'll buy him MC for Father's Day.