## Physical Device Driver Reference

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### KBD_ALTERKBDLED (5Ah) - State of Each LED

State of Each LED A bit mask indicating the state of the new LED indicators . A set bit means a particular LED is turned on. A clear bit indicates the LED is turned off. The bit mask is defined as follows:

Bits 15-3 Reserved. Set to 0.
Bit 2 If set, Caps Lock LED turned on. If clear, Caps Lock LED turned off.
Bit 1 If set, Num Lock LED turned on. If clear, Num Lock LED turned off.
Bit 0 If set, Scroll Lock LED turned on. If clear, Scroll Lock LED turned off.

If any of the reserved bits are set, an INVALID_PARAMETER error is returned .