Hidden Devices Causing you the Blues?

When using Citrix PVS (or often when changing hardware on virtual machines) you may often run into instances where you need to remove phantom devices. But how do you know these exist? Device Manager doesn't show them by default. Microsoft outlines how to do this in an old support article.

1. Launch a command prompt with elevated permissions. 
2. At the command prompt, type the following lines, pressing ENTER after each line
   set devmgr_show_nonpresent_devices=1
   cd\%SystemRoot%\System32
   start devmgmt.msc
3. In the Device Manager View Menu, select Show Hidden Devices

Reference: KB241257