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Why is activating a window not reliable?

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I notice that Autoit doesn't reliably switch windows which in terms messes up the entire program because the correct window is not in focus.  This is the code I have


  The title of the window I want to activate for example is 'Foundation Production - CUSTOMERS -- LARRY SMITH'. 

  It will switch most of the time but sometimes it simply doesn't do that .   I was curious what to do to make it 100% reliable.    Is there any way to notice the window is active before executing a certain portion of the program?

Thanks much,

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If you're using Send and MouseClick on the active window you should probably use ControlSend and ControlClick instead. Send is very unreliable as it never checks to see if the window you want is the active one, it just sends characters to whatever is active at the time, same with MouseClick.

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