My MB is set up exactly this way.
Your library obviously needs to be in a network location.
You will need to convert all the paths in your library and playlists to use the network reference rather than the drive reference. You can do this using the File->Library->Relink Music File Paths tool. Rather than pointing at D:\Music\ it points at \\PCA\Music\
You will also need to change things like "Edit->Edit Preferences->Tags(1)...artist pictures location" (etc) to use the network reference.
This way if you open MB on either computer and point it at the same library, it will access the files.
It's not simple, but it's possible. It has been discussed many times. There's no guide per se, but there should be enough out there to help you figure it out if you're a little resourceful.