Option Explicit
Private Declare Sub keybd_event Lib "user32" (ByVal bVk As Byte, ByVal bScan As Byte, ByVal dwFlags As Long, ByVal dwExtraInfo As Long)
Private Declare Function GetKeyState Lib "user32" (ByVal nVirtKey As Long) As Integer
Private Declare Function MapVirtualKey Lib "user32" Alias "MapVirtualKeyA" (ByVal wCode As Long, ByVal wMapType As Long) As Long

Const KEYEVENTF_EXTENDEDKEY = &H1
Const KEYEVENTF_KEYUP = &H2

Public Sub SetNumLock(ByVal bLock As Boolean)
Dim i As Boolean, ScanCode As Long
i = CBool(GetKeyState(vbKeyNumlock) And vbShiftMask)
If i <> bLock Then
   ScanCode = MapVirtualKey(vbKeyNumlock, 0)
   Call keybd_event(vbKeyNumlock, ScanCode, 0, 0)
   Call keybd_event(vbKeyNumlock, ScanCode, KEYEVENTF_KEYUP, 0)
End If
End Sub
Public Sub SetScrollLock(ByVal bLock As Boolean)
Dim i As Boolean, ScanCode As Long
i = CBool(GetKeyState(vbKeyScrollLock) And vbShiftMask)
If i <> bLock Then
   ScanCode = MapVirtualKey(vbKeyScrollLock, 0)
   Call keybd_event(vbKeyScrollLock, ScanCode, 0, 0)
   Call keybd_event(vbKeyScrollLock, ScanCode, KEYEVENTF_KEYUP, 0)
End If
End Sub
Public Sub SetCapsLock(ByVal bLock As Boolean)
Dim i As Boolean, ScanCode As Long
i = CBool(GetKeyState(vbKeyCapital) And vbShiftMask)
If i <> bLock Then
   ScanCode = MapVirtualKey(vbKeyCapital, 0)
   Call keybd_event(vbKeyCapital, ScanCode, 0, 0)
   Call keybd_event(vbKeyCapital, ScanCode, KEYEVENTF_KEYUP, 0)
End If
End Sub

Private Sub Command1_Click()
Call SetScrollLock(True)
End Sub