Abstract: Some embodiments of a three-way communication protocol have been presented. In one embodiment, a message receiver receives a message from a message transmitter. The message may include an idempotent identification (ID). The message receiver records the idempotent ID, and sends a first acknowledgement of the message to the message transmitter in response to receipt of the message. In response to receipt of a second acknowledgement from the message transmitter acknowledging the message transmitter's receipt of the first acknowledgement, the message receiver discards the idempotent ID.

Abstract: As method is disclosed for retrieving data from a relational database management system (RDBMS). An object-oriented environment submits a query to an object relational layer to access data contained in the RDBMS. The object query can result in at least one logical object description that is defined using one or more predetermined expressions. The logical object descriptions are translated to corresponding relational descriptions, and a relational query is subsequently generated. The relational query is applied to the RDBMS in order to retrieve data satisfying the object query. Various error checks can be performed to detect correctness of the query. Additionally, the relational queries can be optimized to improve processing by the RDBMS.

Abstract: A system, method and medium for utilizing a parameter hierarchy having state information to generate a uniform resource locator (URL). In one embodiment of the present invention, a method includes the steps of creating a component hierarchy that includes at least one component object associated with a web page, and creating a parameter hierarchy that includes at least one parameter object that includes state information respectively associated with at least one of said component objects. Finally, the parameter hierarchy is utilized to generate a URL that can render the component hierarchy.

Abstract: Some embodiments of a three-way communication protocol have been presented. In one embodiment, a message receiver receives a message from a message transmitter. The message may include an idempotent identification (ID). The message receiver records the idempotent ID, and sends a first acknowledgement of the message to the message transmitter in response to receipt of the message. In response to receipt of a second acknowledgement from the message transmitter acknowledging the message transmitter's receipt of the first acknowledgement, the message receiver discards the idempotent ID.