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Here's a short UDF that will, at least in most cases, detect whether a window can be copied from or pasted to programmatically--for example, by Send()ing ctl-c, ctl-v. This is often disabled when programs (like your AutoIt script) run at a lower UAC integrity level than the application they are trying to operate on. #include <WinAPI.au3> Func _WindowIsPasteable($handle) ;accepts window handle; returns true or false whether a window will accept Ctl-C, Ctl-V Local $bCanPaste = True Local $hTestWindowPID = 0 Local $hTestWindowTID = _WinAPI_GetWindowThreadProcessId($handle, $hTestWindowPID) _WinAPI_AttachThreadInput(_WinAPI_GetCurrentThreadId(), $hTestWindowTID, True);attach to window we want to paste into $bCanPaste = _WinAPI_GetFocus() ;Test whether window is paste-able--returns False if it is not _WinAPI_AttachThreadInput(_WinAPI_GetCurrentThreadId, $hTestWindowTID, False);detach from window thread Return $bCanPaste EndFunc Pass it a window handle; it returns true or false whether a window will accept programmatic pasting. The function may not work on the CMD window, since it handles the clipboard uniquely. This function works by attaching to the program thread of the window whose handle it receives, then attempting to perform a GetFocus on that thread. In most cases, the attempt will fail if the window will not accept programmatic copy-paste.