[Trickery]

I believe both of your questions have been addressed.

Question:

Originally Posted by gkbeer

If I run Calibre-server from the command line on my home server (actually as a daemon), and share the library folder from that server as well. I may, from any other machine on my home net, run Calibre, interactively, and edit the library, of the server, without shutting down Calibre-server.

Answer:

You can run a content server against a database that is open read/write by calibre. The content server checks if the DB has changed and does its work again when the DB changes.

Question:

Originally Posted by gkbeer

Edit: New question, Can a single Calibre database be edited by multiple interactive sessions of Calibre?

Answer:

Originally Posted by EricLandes

Only one installation should operate on a given library at any one point in time.

The key to the problem is metadata.db. If that file is open from one computer, changes made with the 2nd computer won't be recognized. You'll be able to successfully add files into the Calibre file system, but the original machine won't know they're in the database.

So, not a recommended practice.

So yes, if you run the content server as a daemon you have no problem making changes to the library. The content server daemon will use the updated library. Also to answer your second question, you can have multiple computers with calibre pointing to a network folder making changes to a library. Just don't have calibre running on multiple computers or make changes at the same time or it could cause problems.