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.
There are so many things in my life that would be completely not on within the conservative church. And yet I think of myself as a reasonably decent human being. With all sorts of flaws, you know, but still reasonably decent. If I did believe in Heaven and Hell, I would really, honestly, believe I was going to go to Heaven.