C:\Windows\system32>bcdedit /? ID
IDENTIFIERS
Many of the Bcdedit commands require identifiers. An identifier
uniquely identifies entries contained in the store. An identifier takes the
form of a globally unique identifier, or GUID. A GUID has the following format,
where each "x" represents a hexadecimal digit.
{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
For example:
{d2b69192-8f14-11da-a31f-ea816ab185e9}
The position of the dashes (-) and the braces at the beginning and end of the
GUID are required.
Several entries can be identified by well-known identifiers. If an entry has a
well-known identifier, BCDedit displays it in output unless the /v command-line
switch is used. For more information, run "bcdedit /? /v".
The well-known identifiers are as follows:
{bootmgr} Specifies the Windows boot manager entry.
{fwbootmgr} Specifies the firmware boot manager entry,
specifically on systems that implement the
Extensible Firmware Interface (EFI) specification.
{memdiag} Specifies the memory diagnostic application entry.
{ntldr} Specifies a OS loader (Ntldr) that can be used
to start operating systems earlier than Windows
Vista.
{current} Specifies a virtual identifier that corresponds to
the operating system boot entry for the operating
system that is currently running.
{default} Specifies a virtual identifier that corresponds to
the boot manager default application entry.
{ramdiskoptions} Contains the additional options required by the
boot manager for RAM disk devices.
{dbgsettings} Contains the global debugger settings that can be
inherited by any boot application entry.
{emssettings} Contains the global Emergency Management Services
settings that can be inherited by any boot
application entry.
{badmemory} Contains the global RAM defect list that can be
inherited by any boot application entry.
{globalsettings} Contains the collection of global settings that
should be inherited by all boot application
entries.
{bootloadersettings} Contains the collection of global settings that
should be inherited by all Windows boot loader
application entries.
{resumeloadersettings} Contains the collection of global settings that
should be inherited by all Windows resume from
hibernation application entries.
{hypervisorsettings} Contains the hypervisor settings that can
be inherited by any OS loader entry.