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copied!<p>SendKeys is not a good fit mainly due to:</p> <ul> <li>It can only send keys to active/focused application, which is never guaranteed to work because the the active application can change between the time the keys are actually sent.</li> <li>RDP and many other libraries (e.g., DirectX) block them mainly for security reasons.</li> </ul> <p>Better alternatives:</p> <ul> <li>Use <a href="http://msdn.microsoft.com/en-us/library/ms644950%28v=vs.85%29.aspx" rel="nofollow noreferrer"><code>SendMessage</code></a> or <a href="http://msdn.microsoft.com/en-us/library/ms646310%28VS.85%29.aspx" rel="nofollow noreferrer"><code>SendInput</code></a> for simple needs</li> <li>Some good examples of how to use SendMessage can be found: <ul> <li><a href="http://www.codeproject.com/KB/vb/Send_string_by_message.aspx" rel="nofollow noreferrer">Send strings to another application by using Windows messages</a></li> <li><a href="http://pinvoke.net/default.aspx/user32.SendMessage" rel="nofollow noreferrer">SendMessage via pInvoke</a> </li> <li><a href="http://www.blitzmax.com/Community/posts.php?topic=48863" rel="nofollow noreferrer">How To Send Keystrokes To Extern Win Application </a></li> </ul></li> <li>For more elaborate needs, it is recommended to use <a href="http://msdn.microsoft.com/en-us/library/ms731082.aspx" rel="nofollow noreferrer">WCF</a></li> <li>To get you started, read this <a href="http://www.switchonthecode.com/tutorials/wcf-tutorial-basic-interprocess-communication" rel="nofollow noreferrer">Basic Tutorial</a> that talks about Inter Process Communication</li> </ul> <p>Sample code using <a href="https://stackoverflow.com/questions/2113950/how-to-send-keystrokes-to-a-window"><code>SendMessage</code></a>:</p> <pre><code>HWND hwndNotepad = FindWindow(_T("Notepad"), NULL); HWND hwndEdit = FindWindowEx(hwndNotepad, NULL, _T("Edit"), NULL); SendMessage(hwndEdit, WM_SETTEXT, NULL, (LPARAM)_T("hello")); </code></pre>

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