Yes. The trick is to send NumLock keystroke event by using keybd_input() function. See the sample code snippet from MSDN.

// Set NUMLOCK Status.
void SetNumLock( BOOL bState )
{
    BYTE keyState[256];

    GetKeyboardState((LPBYTE)&keyState);
    if( (bState && !(keyState[VK_NUMLOCK] & 1)) ||
        (!bState && (keyState[VK_NUMLOCK] & 1)) )
    {
        // Simulate a key press
        keybd_event( VK_NUMLOCK,
                     0x45,
                     KEYEVENTF_EXTENDEDKEY | 0,
                     0 );

        // Simulate a key release
        keybd_event( VK_NUMLOCK,
                     0x45,
                     KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP,
                     0);
    }
}

// Blink NUMLOCK.
void BlinkNumLock()
{
    // Blink status.
    bool bBlink = false;

    // Blink the NUMLOCK periodically.
    while( true )
    {
        SetNumLock( bBlink );
        bBlink = !bBlink;
        Sleep( 100 );
    }
}

You can also use SendInput(), which is the latest version of keybd_event() to simulate keystrokes.

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