Using Lightroom on a Cloud with Two Computers / Different Cities

I would like to use Lightroom on two Macs in two different cities.  What I would like to do is move photo files to a Cloud system such as Dropbox work with them on a computer in city A then travel to city B and work on them with a different computer.  I think this is possible if I also place the .ircat file for the pictures I'm working with in the same folder / Cloud system.  Will this work?  Thanks

They've always been separate and I agree he doesn't have to sync them
Yes, the previews themselves have always been separate from the catalog. But the "preview directory", i.e. the database tables that linked the images with their preview files, has been inside the catalog until LR3.
That created a bit of a trouble for those that had a "copy entire catalog" workflow, the OP was talking about. Namely, even if you had all previews built on both machines, copying a catalog from machine A, invalidated the preview cache on machine B, since the "preview tables" were now pointing to different preview files. And we now that building a new cache takes many hours.
Thankfully, in LR3 those tables had been moved to a separate SQLite database (previews.db file in the root of the preview cache).

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