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KEYEVENTFEXTENDEDKEY is a flag that can be used in the keybdevent function to specify whether a key is a standard or extended key. A standard key refers to keys such as A, B, C, etc. while an extended key refers to keys such as F1-F12, Home, End, etc.
When the KEYEVENTF_EXTENDEDKEY flag is set, it indicates that the key being pressed or released is an extended key. This flag is typically used in combination with other flags to simulate keyboard input in applications where extended keys are required.
For example, if a user needs to simulate pressing the F2 key, the KEYEVENTF_EXTENDEDKEY flag would need to be set along with the corresponding scan code for the F2 key.
In summary, KEYEVENTFEXTENDEDKEY is a flag that is used in the keybdevent function to specify whether a key is a standard or extended key.