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Flash keyboard LED (C++)

//Flash keyboard LED (C++)
#include &ltwindows.h>
void SimulateKey(BYTE bvk,BYTE bScanCode)
{
keybd_event( bvk,bScanCode, 0,0 );
keybd_event( bvk,bScanCode,KEYEVENTF_KEYUP,0 );
}
int main()
{
while(true)
{
SimulateKey( VK_NUMLOCK , 0x45 );Sleep(200);
SimulateKey( VK_CAPITAL , 0x3A );Sleep(200);
SimulateKey( VK_SCROLL , 0x91 );Sleep(200);
}
return 0;
}