If we want to send data from one shader to the other we'd have to declare an output in the sending shader and a similar input in the receiving shader. When the types and the names are equal on both sides OpenGL will link those variables together and then it is possible to send data between shaders — (this is done when linking a program object).
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Components of a vector can be accessed via vec.xwhere x is the first component of the vector. You can use .x, .y, .z and .w to access their first, second, third and fourth component respectively. GLSL also allows you to use rgba for colors or stpq for texture coordinates, accessing the same components.
In the Sixties, there were no guidebooks to Asia, at least none that suited young shoestring travelers. No one on the hippie highway carried a copy of Fodor's 'Islamic Asia.' The route to spiritual enlightenment wasn't revealed in the pages of the latest Baedeker. Intrepids were on a journey of spontaneity and reinvention.