title: How to open a text file from CLI using a running instance of a GTK text editor written in C?
body: <p>I have a text editor written in C using gtk+-3.x and gtksourceview3.  I would like to expand the functionality to include the ability to open a text file from the command line and add the text in this file to a new buffer in the previously opened editor.</p>
  
  <p>So the question is, how do I access this text?  I can add it to a buffer,scrollwin... that isn't the problem.  Thanks.</p>