It's all too easy to get lost in thickets of technical terms. A server, for most CAE users, is a high performance computer which is used for computationally demanding tasks. Engineers tasked with installing / maintaining commercial CAE applications are also familiar with license servers. A Python server is the glue that's essential for automation: it allows your Python program (i.e. client) to communicate with Pointwise or Tecplot or both (i.e. the server). See this article for a quick outline of the terms involved.
In the next issue on this topic: Macros vs. Python applications.