This article contains general information about Synergy usage.
Sub Clients: From the client side, you can create a new client as a sub-client of the current client, and give them access to some (or all) of the servers that the main client has access to.
Super Clients: From the client side, you can create a new super client from the current client. This super client will have access to everything the client has access to, including servers and sub-clients.
Can also create their own super and sub-clients, but can only give access to servers and sub-clients directly assign/created by the super itself. Does not give access to servers or sub-clients if super has access provided by another client or super.