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kernel handle

A handle that can only be accessed in kernel mode. A handle is a kernel handle if it is created with the OBJ_KERNEL_HANDLE flag. For more information see the topic InitializeObjectAttributes.

kernel mode

The privileged processor mode in which NT-based operating system executive code runs. A driver or thread running in kernel mode has access to system memory and hardware.

See also executive and user mode.

kernel space

A block of virtual memory, dedicated to the use of kernel-mode code. Generally, the kernel space is a range of high-order virtual addresses around one to two gigabytes in size.

See also system space, hyperspace, pool memory, and user space.

kernel streaming object

An individual kernel streaming component represented to a client as a file object. Includes filters, pins, clocks, and allocators.

For more information, see the topic FILE_OBJECT.

kernel transaction manager (KTM)

A transaction management service that enables you to create a transaction processing system (TPS) in user mode or kernel mode (or both). For more information about KTM, see Using Kernel Transaction Manager.

key object

An object type defined by the configuration manager that represents an entry in the registry database. Each instance of a key object represents a registry node, that is, part of a registry path to a set of subkeys, or it contains value entries.