The direct link capability of the MTA enables it to use a mapped or UNC path to access a domain directory in another GroupWise system or to use TCP/IP to connect to the domain's MTA. This is the same functionality that enables two domains in the same GroupWise system to be connected.
Because messages are transferred directly from one MTA to another, no GroupWise client functionality is lost.
Administratively, you can use the External System Synchronization feature to exchange information between the two systems and enable users to select addresses from the Address Book, or you can choose to not exchange information and require users to enter a fully-qualified address (userID.post_office.domain or user@host).
For information about connecting GroupWise systems via direct links, see Using Direct Links.