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    <p>Your best (and by far safest) bet is to create a service that accepts the SERVICE_CONTROL_SESSIONCHANGE control.</p> <p>This will allow your service control handler to receive a control whenever a user logs on, logs off, locks the session, and various other options. Look for more info in a link blow.</p> <p>This is done by creating a service which has the SERVICE_ACCEPT_SESSIONCHANGE flag in the dwControlsAccepted, as following:</p> <pre><code>SERVICE_STATUS ss; ... ss.dwControlsAccepted |= SERVICE_ACCEPT_SESSIONCHANGE; </code></pre> <p>Followed by:</p> <pre><code>// This lets the service accept the session change ctrls // The service handle here is received by calling RegisterServiceCtrlHandler SetServiceStatus(hServiceHandle, &amp;ss); </code></pre> <p>This will allow windows to send SERVICE_CONTROL_SESSIONCHANGE controls to your HandlerEx function, which should look something like this:</p> <pre><code>DWORD WINAPI HandlerEx(DWORD dwControl, DWORD dwEventType, LPVOID lpEventData, LPVOID lpContext) { switch (dwControl) { ...// Regular control handling case (SERVICE_CONTROL_SESSIONCHANGE): switch(dwEventType) { case(WTS_SESSION_LOGON): // Handle logon break; case(WTS_SESSION_LOCK): // Handle lock break; ... } break; ... } } </code></pre> <p>You can read up on all the different session change notifications you can receive from here: <a href="http://msdn.microsoft.com/en-us/library/aa383828%28v=VS.85%29.aspx" rel="noreferrer">WM_WTSSESSION_CHANGE</a>, all the notifications you'll need are in the wParam part of the description.</p> <p>Well, that's the gist of it anyway. You can read more info on the handlerex function here: <a href="http://msdn.microsoft.com/en-us/library/ms683241%28VS.85%29.aspx" rel="noreferrer">HandlerEx</a> and more information about services in general here: <a href="http://msdn.microsoft.com/en-us/library/ms685942%28v=VS.85%29.aspx" rel="noreferrer">Service Functions</a>. I suggest you read up on the ServiceMain function, RegisterServiceCtrlHandler function and, most importantly, read the examples posted on the MSDN pages. They're super helpful.</p> <p>Good luck!</p>
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