An access service is the client connection point for a DirectConnect server. You can think of it as the pairing of a service library with a set of specific values for the configuration properties. You must define at least one access service for every service library.
Access services allow clients to access data from a specific target. Each access service is a specific set of configuration properties that:
Transforms SQL
Convert datatypes
Supports remote procedure calls (RPCs)
Transfers data between the target database and other servers accessible through Open Client
Supports Catalog Stored Procedures (CSPs) and system stored procedures
