ValueMeaning0-15Specifies the repeat count. The value is the number of times the keystroke is repeated as a result of the user holding down the key.16-23Specifies the scan code. The value depends on the original equipment manufacturer (OEM)24Specifies whether the key is an extended key, such as the right-hand ALT and CTRL keys that appear on an enhanced 101- or 102-key keyboard. The value is 1 if it is an extended key; otherwise, it is 0.25-28Used internally by Windows.29Specifies the context code. The value is 1 if the ALT key is held down while the key is pressed; otherwise, the value is 0.30Specifies the previous key state. The value is 1 if the key is down before the message is sent, or it is 0 if the key is up.31Specifies the transition state. The value is 1 if the key is being released, or it is 0 if the key is being pressed.
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