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Is there a document that explains the why's and wherefores of dbus? Aside from those posts.

You can probably find it here:

https://wiki.freedesktop.org/www/Software/dbus/

Is there a paper/article that discusses and categorizes the differences between IPC mechanism? Their pros and cons etc. What mechanisms are there? What is used on Windows? OS X/iOS? QNX? BeOS? Android? Solaris? etc.

The Wikipedia article on IPC https://en.wikipedia.org/wiki/Inter-process_communication is really incomplete.

this article compare kdbus (and thus dbus) to android's binder: http://kroah.com/log/blog/2014/01/15/kdbus-details/

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