Tip:Tweak Device Manager for a more Complete View of Devices
By default, Device Manager displays information about all currently installed and connected Plug and Play devices. To view devices that use non-Plug and Play drivers, as well as previ¬ously installed devices that are not currently connected, you need to tweak Device Manager.
Setting the DEVMGR environment variable as described here affects only the instance of Device Manager launched from that Command Prompt window. If you want the change to be persistent, open Control Panel, open System, click Advanced System Settings, click Environment Variables on the Advanced tab, and define a new variable for this setting. If you add the variable to the User Variables section, the setting will apply only to the current user. If you edit the System Variables section, the extra information will be visible in Device Man¬ager for all users of the current computer.