javascriptjdownloader
How can a website check if a application is running on my pc
Today I've visited a website which allows to download files using the JDownloader. There was this image on the website:
That image changes to this picture if my pc is running the JDownloader client:
Now my question is: How can this website know, that this application is running on my computer? I can't think of a way to do it.
Solution
It looks like JDownloader runs an HTTP server on your local machine and makes the URL http://127.0.0.1:9666/jdcheck.js available, which can then be used to check that it is running. See here:
http://jdownloader.org/knowledge/wiki/glossary/cnl2#check-if-jdownloader-is-running
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