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I'm trying to drive a command prompt by sending instructions via a NamedPipe. This way you can (should) be able to send commands to the command prompt and at the same time "view" the result in the same window. This is not allowed if you run a command prompt with "opt_flag" parameters (redirected streams) because this will disable StdOut on the cmd itself. This small (trivial) snippet works for the first command sent to the cmd, but further submissions will fail. Maybe the problem is in how I use the run () command to start a new cmd with the StdIn redirect from the NamedPipe. It seems that the generated cmd will close automatically after the first reception of the command via NamedPipe. suggestions on how to make it work are welcome thanks #include <NamedPipes.au3> #include <WinAPI.au3> ; Creates an instance of a named pipe Global $sPipeName = "\\.\pipe\pipename" Global $hPipe = _NamedPipes_CreateNamedPipe($sPipeName, 1, 1) MsgBox(0, "Debug", "Pipe created. Now open a CMD") ; run a cmd with only StdIn redirected (StdIn data incoming from a pipe) Global $hCMD = Run(@ComSpec & " /K cmd < " & $sPipeName & @CRLF, "c:\") ; ok? MsgBox(0, "Debug", "now Send a command to the cmd via a NamedPipe") _StdInPipeWrite("dir" & @CRLF) MsgBox(0, 'Debug', "further commands will fail" & @CRLF & "now send command 'dir c:\windows'") $sMessage = "Dir c:\windows" & @CRLF _StdInPipeWrite($sMessage) MsgBox(0, 'Debug', "send another command (will also fail)" & @CRLF & "now send command 'echo Hello'") _StdInPipeWrite("echo Hello" & @CRLF) MsgBox(0, "Debug", "end of test") ProcessClose($hCMD) Func _StdInPipeWrite($sMessage) ; =============================================================================================================================== ; This function writes a message to the pipe ; =============================================================================================================================== Local $iWritten, $iBuffer, $pBuffer, $tBuffer $iBuffer = StringLen($sMessage) + 1 $tBuffer = DllStructCreate("char Text[" & $iBuffer & "]") $pBuffer = DllStructGetPtr($tBuffer) DllStructSetData($tBuffer, "Text", $sMessage) If Not _WinAPI_WriteFile( _ $hPipe, _ ; ...... Handle to the file to be written $pBuffer, _ ; .... Pointer to the buffer containing the data to be written $iBuffer, _ ; .... Number of bytes to be written to the file $iWritten, _ ; ... The number of bytes written 0 _ ; ............ [optional] A $tagOVERLAPPED structure or a pointer to it ) Then ConsoleWrite("WriteMsg: _WinAPI_WriteFile failed" & @CRLF & _WinAPI_GetLastErrorMessage()) Else ConsoleWrite("WriteMsg: write OK" & @CRLF & _WinAPI_GetLastErrorMessage() & @CRLF) EndIf EndFunc ;==>_StdInPipeWrite