## Physical Device Driver Reference

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### KBD_QUERYKBDHARDWAREID (7Ah) - Data Length

Data Length On input, Data Length specifies the maximum number of returned data bytes requested by the caller. The Length value on input includes the length field's size. An input length field value of less than 2 is returned to the caller with an INVALID_PARAMETER error.

On output, Data Length always indicates the maximum number of bytes that this function can return. For OS/2 2.1, this return length size is 4 bytes .