Removing Hidden COM ports for Non-connected Devices

Really good article that describes how to remove hidden COM ports for Non-connected Devices, http://www.rttycontesting.com/lagniappe/removehiddencomports.html
The trick is to set the environment variable devmgr_show_nonpresent_devices to 1 as described in Microsoft KB-article 315539, http://support.microsoft.com/kb/315539/en-us.

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