Any browser with COM directive can be implemented, but since IE is build into Windows then its it nature to have a COM directive. If I don't remember wrong then other applications such as Photoshop, Office ect. have a COM directive aswell.

However I already guessed it was using the imagegrabwindow() / imagegrabscreen() functions, however they can be EXTREMELY slow and you will also need to grand your webserver permissions to interact with the desktop in services.msc

=)

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