We have two types of posts in an organization:
A line post has to do with organizational lines; seeing that the lines run smoothly; ironing out any ridges in the lines; keeping particles flowing smoothly from one post to another post. A line post is concerned with the flow of lines, not necessarily with the fixed-terminal posts at the end of the lines.
An example of this is a communicator. His job is mainly keeping communications flowing smoothly from one terminal to another. Any time there is a stop in the flow of communications, he straightens it out. Other examples of line posts are HCO Area Secretary, Central Files Promotion Liaison, Training Administrator, and Processing Administrator.
A fixed-terminal post stays in one spot, handles specific duties and receives communications, handles them, and sends them on their way.