This is a 16 byte field that indicates the service name used in the Link3270 server adapter for Link3270 State file processing. This is an optional user-defined parameter. It can be used to provide part of the Link3270 State file key if it is desirable to have multiple bridge facilities allocated, remain allocated and in use for a specific userid in adapter server processing. Facility session state information can be retained for a facility for a specific userid for use in the processing of one adapter server request (a service) while other facilities for that same specific userid may be in use in the processing of other adapter server requests (other services) concurrently, for example, multiple facilities allocated and in use for the same userid concurrently where session state information must be retained.