Thanks for your answer; within 5 minutes of joining, I found the perfect solution to the problem I was investigating.
I wanted to divide my library into technical manuals and pleasure reading (thankfully, there's a difference for me), but wanted to only share the pleasure reading with friends and family.
Note that this works on Linux if you leave out the ".exe" part. I tried it out, and it worked perfectly.
Left coast, Calif.
Originally Posted by ilovejedd
Yep, using the calibre-server.exe command line utility. Note, you'll have to assign different port numbers for each calibre-server instance.
calibre-server - calibre User Manual