The service type defines the Adaptive Server’s service. The two service types are MASTER and QUERY:
MASTER defines the service that Adaptive Server uses to listen to login requests from clients. This type defines a server machine.
A MASTER entry is required only if you plan to use your computer as a server. It is not required in a sql.ini file for a computer that is running clients only.
QUERY represents the service that a client application uses to log in to Adaptive Server. This type defines a client machine.
A QUERY entry is required if you plan to use your computer to access a server. In general, since even dedicated servers need access to other servers, a QUERY entry is always required.
