Input/Output Addresses Are Used By Aliases in Device ManagerID: Q180412 
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When you use Device Manager to view the input/output (I/O) addresses of devices in your computer, some I/O addresses may be used by Alias Of <device>, where <device> is the name of a device that is currently in your computer.
This behavior can occur if your computer contains unused I/O addresses.
This behavior is by design.
In Microsoft Windows 95, all unused I/O addresses are assigned to In Use By Unknown Device. In Windows 98, all unused I/O addresses are assigned to aliases of devices that are currently in your computer. I/O addresses that are assigned to a device alias can be used by new devices you add to your computer.
Keywords          : kbenv kbhw kbtool win98 
Version           : WINDOWS:
Platform          : WINDOWS 
Issue type        : kbprb 
Last Reviewed: January 30, 1999