Before GroupWise 8, if you wanted users in your GroupWise system to be able to exchange messages conveniently with users in another GroupWise system, you needed to set up external domains, external post offices, and external users, or use dynamic Internet links, as described in later sections.
Starting with GroupWise 8, you can set up an Internet domain in GroupWise to represent the other GroupWise system. As a result, messages are routed to the other GroupWise system based on links set up in the Link Configuration Tool, rather than through the Internet Agent.
For information about connecting GroupWise systems via external system links, see Section 2.0, Using External System Links.