What is the difference between Polling and Subscribing communication methods, when using WanLink?

Answer:
- SUBSCRIBE: This communication method involves changes being fetched from the WanServer only when it changes. This is the default option, because it is the more efficient method. - POLLING: This communication method involves the use of a polling period in which the values are to be fetched from their WanServers. This is used primarily for those Agents that cannot be subscribed to, for example haspinfo.