A CompleteFTP cluster consists of a primary server and one or more secondary servers.
The primary server adds secondary servers to the cluster as described here.
Typically, each server in the cluster (including the primary) must be activated separately, to obtain
and set its own activation key.
There is another way to accomplish activation on clusters for Volume License customers who have purchased a
universal activation key (UAK). If the UAK is installed first on the primary server,
then it will be automatically propagated to each secondary server as it is added to the cluster. This means secondary
servers can be automatically activated from the trial state.