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manufacturer
VK_PACKET
E7
Used to pass Unicode characters as if
they were keystrokes. If VK_PACKET is
used with SendInput, then the Unicode
character to be delivered should be
placed into the lower 16 bits of the scan
code. If a keyboard message is removed
from the message queue and the virtual
key is VK_PACKET, then the Unicode
character will be the upper 16 bits of the
lparam.
E8
Unassigned
E9-F5
Specific to original equipment
manufacturer
VK_ATTN
F6
ATTN key
VK_CRSEL
F7
CRSEL key
VK_EXSEL
F8
EXSEL key
VK_EREOF
F9
Erase EOF key
VK_PLAY
FA
PLAY key
VK_ZOOM
FB
ZOOM key
VK_NONAME
FC
Reserved for future use
VK_PA1
FD
PA1 key
VK_OEM_CLEAR FE
CLEAR key
VK_KEYLOCK
F22
Key used to lock device