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What is the purpose of multiple graphics cards?
"In this case you are right that they cannot be used to drive the same display" at once. Different cards can have different purposes, especially on mobile (battery vs graphic power, for instance) and they can switch dynamically.
How to convert Word (doc) to PDF from Windows command line?
In theory, although the OP mentioned this being used as part of a custom Java app. For our use it was convenient to have the conversion happen on the commandline so I wrapped more or less the sample code provided on the website in a tiny executable.