hkl parameter is actually an input locale identifier. This is a broader concept than a keyboard layout, since it can also encompass a speech-to-text converter, an Input Method Editor (IME), or any other form of input. Several input locale identifiers can be loaded at any one time, but only one is active at a time. Loading multiple input locale identifiers makes it possible to rapidly switch between them. When multiple IMEs are allowed for each locale, passing an input locale identifier in which the high word (the device handle) is zero activates the first IME in the list belonging to the locale.The KLF_RESET and KLF_SHIFTLOCK flags alter the method by which the Caps Lock state is turned off. By default, the Caps Lock state is turned off by hitting the Caps Lock key again. If only KLF_RESET is set, the default state is reestablished. If KLF_RESET and KLF_SHIFTLOCK are set, the Caps Lock state is turned off by pressing either Caps Lock key. This feature is used to conform to local keyboard behavior standards as well as for personal preferences.