Here's a description of all of the input buttons for this box:
TAG is the map pointer from the Texture Shader.
MODE is the mapping method: 0 = orthographic projection
1 = spherical projection
2 = cylindrical projection
COMP is which component of the map to use: 1 = alpha
2 = intensity
MAG is the magnitude of the displacement.
The x against the outside of the button means these buttons cannot
accept inputs. They are constant settings and as such cannot become
procedually set variables. These inputs also cannot become arguments to
the shader for the same reason. You will notice they are greyed out
in the Argument Editor.The output is DIS the DisTex pointer from the Texture Shader for the soft_displace box.