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I want to read the source code of an arduino library that comes with the IDE. Specifically the GSM.h

I dont know the location of the standard libraries that come with the IDE.

I only know the location of the user installed libraries.

So where is the source code of GSM.h?

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Ok, i found out the location. In Win 7, it is C:\Program Files (x86)\Arduino\libraries

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    Those are the standard libraries. If you want to add libraries, it's (I think) preferred to add them to the `My Documents\Arduino\libraries` folder. – Gerben Jul 1 '14 at 16:59
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    Definitely preferred. Otherwise you lose your user-installed libraries when you upgrade to the next version. – Nick Gammon Jun 29 '15 at 22:00

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