WinCC Web Navigator check when user logs out

[Neogazz777]

I am using WinCC Web Navigator V7.5. Is there any C or VB Script that can be used to check when a user logs out and then use this event to login a default view only user?

Example of what I want to do:
---- Run only on Web Navigator ----
If (users_logged_out) {
login_user = View_Only }

I have heard of the use of the following code, but no idea how to implement for my application:
----------------------------------
#include "apdefap.h"
void OnClick(char* lpszPictureName, char* lpszObjectName, char* lpszPropertyName)
{
#pragma code("useadmin.dll")
#include "PWRT_api.h"
#pragma code()
PWRTLogout();
}
----------------------------------
#include "apdefap.h"
void OnClick(char* lpszPictureName, char* lpszObjectName, char* lpszPropertyName)
{
#pragma code("useadmin.dll")
#include "PWRT_api.h"
#pragma code()
PWRTLogin('c');
}
----------------------------------
#ifndef RUN_ON_WEBNAVIGATOR
{
#pragma code ()
#include "PWRT_api.h"
#pragma code();
PWRTLogout();
}
#endif