LowLevelKeyboardProc + Alt key

[riov]

Ok, that’s my code. It is working, but is it correct? I mean, have I left no mistakes here?

Function LowLevelKeyboardProc(ByVal nCode As Long, ByVal wParam As Long, lParam As KBDLLHOOKSTRUCT) As Long
    If nCode = HC_ACTION Then
          If CBool(lParam.flags And LLKHF_ALTDOWN) Then
                If lParam.vkCode = VK_TAB Then
                    Debug.Print "Alt+Tab allowed"
                    LowLevelKeyboardProc = 0
                Else
                    Debug.Print "Alt blocked"
                    LowLevelKeyboardProc = -1
                End If
                Exit Function
          End If
    End If
    
    LowLevelKeyboardProc = CallNextHookEx(0, nCode, wParam, ByVal lParam)
End Function

I have found this on msdn:

If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.
If nCode is greater than or equal to zero, and the hook procedure did not process the message, it is highly recommended that you call CallNextHookEx and return the value it returns; otherwise, other applications that have installed WH_KEYBOARD_LL hooks will not receive hook notifications and may behave incorrectly as a result.

According to this, my code is no correct or is it?