Step 2
After exporting the master catalog, I disconnected the removable drive from the iMac computer and connected it to the laptop. On the laptop computer, I opened Lightroom, chose File > Open Catalog, used the navigation dialog box shown in Figure 3 to locate and select the exported catalog file on the removable hard drive, and clicked Open. This action opened the warning message shown in Figure 4. I clicked the Relaunch button to restart Lightroom, running from the new catalog.