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Is there anyway to determine when an external app changes

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I would like to be alerted when the contents on an external app changes in any way (such as a textbox value changing). I currently know how to discover the various windows identifiers and read the text property of textboxes and labels, but right now I have to iteratively poll the site to see if anything changes, which is not very efficient. i wondered if there is anything I can set which will monitor the application level window and trigger an event in my code if any content on the external page changes.

Separately, is there any event log file that is automatically generated on a running application, and if so how can it be accessed? I am not aware of anything like this, but my research keeps mentioning a log file, and I was not sure if this is something that the programmer has to implement or if windows does it by itself. Any input would be appreciated.

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