Determine the Comm Port assignments

I have a program more old that needs to use Comm Port 1 to access the unit I connect.  When I open the Device Manager, then the comm ports, I see, it's Comm Port 1 is in use.  How can I determine which device using the port so I can assign a different port of this unit thetreby opening Comm port 1 the device I want to be able to use it?

Hello

Refer to this link and check if it helps.

http://support.Microsoft.com/kb/174904

It will be useful.

Tags: Windows

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