Set the Sync ID on the MASTER server (at bottom of the Layers HUD)
ie layer 1 - Sync ID 1 etc...

When programming the SLAVE server, use the playmode 'SYNC to ID x' depending upon which layer you want to sync to on the MASTER server

You will also need an ethernet cable between the 2 servers (or on a network) with valid IP addresses for them to communicate. Cant remember if you need apple talk enabled or not...

Simon