What is the difference between "attached" and "connected" devices?

What is the difference between "attached" and "connected" devices?

Attached: One or more scanners are physically attached to the PC. Ranger calls AreDevicesAttached to determine if a plug-in should be used to drive devices.  This is needed because multiple plug-ins may be installed on the same PC.

Connected: The specific scanner is powered up and ready for parameters to be set.
Ranger® - The universal check scanner interface
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