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copied!<p>Putting together <a href="https://stackoverflow.com/questions/1430108/1433591#1433591">the <code>cmd</code> and <code>vbs</code> script ideas</a> with the code from <a href="https://stackoverflow.com/questions/267728/267735#267735">the answer to Launch System Screensaver from C# Windows Form</a> I came up with the following:</p> <pre><code>using System; using System.Runtime.InteropServices; public static class LockDesktop { [DllImport("user32.dll", EntryPoint = "GetDesktopWindow")] private static extern IntPtr GetDesktopWindow(); [DllImport("user32.dll")] private static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam); [DllImport("user32.dll", EntryPoint = "LockWorkStation")] private static extern IntPtr LockWorkStation(); private const int SC_SCREENSAVE = 0xF140; private const int WM_SYSCOMMAND = 0x0112; public static void SetScreenSaverRunning() { SendMessage(GetDesktopWindow(), WM_SYSCOMMAND, SC_SCREENSAVE, 0); LockWorkStation(); } public static void Main() { LockDesktop.SetScreenSaverRunning(); } } </code></pre> <p>To build it, <a href="http://smallestdotnet.com/" rel="nofollow noreferrer">install the .NET Framework</a>, copy and paste the above code into <code>lock.cs</code>, then run:</p> <pre><code>%SystemRoot%\Microsoft.NET\Framework\v3.5\csc.exe lock.cs </code></pre> <p>Put the created <code>lock.exe</code> in your path, after that, typing <code>lock</code> should engage the configured screen saver and lock your workstation.</p>

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