Clarifications on "syncing" systems -- i.e. exporting/importing catalogues.

Question

If I want to simply "sync" two computers so that changes or additions I made on one system will be incorporated on the other, do I need to first "export" a catalogue and then import it onto the other system, or can I simply "import" directly without first exporting a separate catalogue? In other words, does the current catalgue (what used to be referred to as a "library") exist as something that can be imported onto another system without first requiring a separate "export"?
Also, what happens if changes are made on BOTH systems when I do the import? What happens if changes have been made to the same shot on both systems? I've looked over various literature on this subject, but I haven't been able to determine how robust LR is at dealing with all the various permutations in this regard.
Thanks,
Larry

Answer 1

>As I understand it, a catalog is a catalog, and you are always in a catalog. No need to export unless you want to create a subset.
Can anyone confirm this? A similar questions was answered in another thread saying you could not do this, so now I've received two answers that directly contradict each other, and don't know which is accurate.
I'm looking for the easiest way to "sync" two systems where changes may have been done on BOTH systems to different pictures. The end result should be that both systems have all the same information on them. I'm still unclear what the specific steps would be to achieve this.
On this note, what if the same photo had new edits on BOTH systems? Is there a way of syncing "both ways" so that both systems ended up showing all the edits from BOTH systems in different snapshots or virtual copies or ???
Thanks,
Larry