EXIT
THE BOX'S MAIN HELP:
This exits the shader, with the return code specified.
IGN (input):
This value is ignored. Can be used to end a chain, to effectively terminate data's travel through the program.
RET (input):
The return value. The default is 0. eg, the exit status returned to the operating system. 0 indicates normal termination, 1 or greater indicates an error.