This was crucial. The "Acquire" tab connected to your scanner (via the TWAIN protocol) or your digital camera (via USB). For many, this was their first experience with a non-destructive "Import" workflow. You could scan a physical 4x6 photo, edit it, and re-print it without ever saving a master file.
Given its age, running this natively on Windows 11 or macOS Sequoia is a challenge. However, nostalgia seekers have found workarounds: arcsoft photoimpression 4