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In order to use same Lightroom catalog on multiple computer, you have to keep your catalog and images on an external drive so that you can work on same files back and forth between different computers.
Hope this helps.
The sync function only works from a source computer i.e Desktop or Laptop with a full Lightroom CC application installed and other mobile devices e.g. iPhone, iPad, Android Smart Phone with Lightroom Mobile app installed. This will need a subscription to the Adobe Photographers CC package.
As far as I am aware its not possible to sync photos in the same way between Laptops and Desktops. just mobile devices.
In addition you can only sync files from one Catalog file at a time.
Well that was a waste of $120 when I could have spent $80 on the LR6 upgrade. I primarily work on my desktop or laptop, not my phone or a tablet. Adobe needs to get this resolved as I am sure I am not the only one who would rather sync between two computers instead of a phone or tablet.