Article ID: 310592 - View products that this article applies to.
This article was previously published under Q310592
This article describes the subkeys contained in the HKEY_LOCAL_MACHINE\Enum registry key in Windows.
The HKEY_LOCAL_MACHINE\Enum key contains subkeys for the specific hardware components your computer uses. Windows uses this information to allocate resources (for example, IO addresses and interrupts for the devices). All values in the Enum subkey are manufacturer-specific and device-specific, so specific information can vary from computer to computer.
Entries in the Enum Subkey
BIOSThis subkey contains entries for Plug and Play components of the BIOS (this includes timers, controllers, and direct memory access [DMA] chips). Each BIOS subkey starts with the string *PNP and is followed by a four-digit number that represents classes by which the components are grouped, as shown in the following example:
*PNP0000Each *PNPxxxx key contains subkeys (00,01) that contain the data (for example, class name, device description string, driver name, and hardware ID) for the device configuration.
ESDIThis subkey contains the configuration data of the IDE-controller used for hard disks and other devices.
FLOPThis subkey contains the configuration data of the floppy disk controllers used in the computer.
HTREEThis subkey is reserved for future use in Windows.
ISAPNPThis subkey contains entries for Plug and Play equipment enumerated on an ISA bus.
MFThis subkey defines manufacturer-specific information about hardware components.
MONITORThis subkey contains information about the monitor used in the computer. If Setup cannot detect the monitor type, the user sets the selection.
NETWORKThis subkey contains information about the network (for example, redirectors, services, and NetBEUI). The network adapter is specified in the Root\Net subkey.
PCIThis subkey contains entries for Plug and Play equipment on a Peripheral Component Interconnect (PCI) bus.
ROOTThis subkey contains *PNPxxxx entries for legacy, non-Plug and Play hardware (for example, the CPU, BIOS, network adapters, and printer drivers).
SCSIThis subkey contains information data for Small Computer System Interface (SCSI) devices.
USBThis subkey contains information data for Universal Serial Bus (USB) devices. USB support is not included in Windows 95.
NOTE: Depending on the computer, you may have have keys for infrared, tape controllers, and modems, if those devices are installed on the system.
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