Abstract: A conversion path for converting between two different currencies is defined as a series of simple exchange rate objects and is encapsulated within a compound exchange rate object. The intelligence regarding the specific rules for making the conversion are encapsulated in a policy class, which governs how the path of exchange rates contained in the compound exchange rate is built. When a client requests conversion between two currencies, the compound exchange rate is constructed according to the policy to contain a path of exchange rate objects that may be used to make the requested conversion, and the compound exchange rate is then returned to the client. When the client then instructs the compound exchange rate to make a conversion of a known currency value in the source currency, the compound exchange rate object uses the exchange rate object or objects in the exchange rate path to perform the currency conversion.

Abstract: A method and system for efficiently managing the manipulation of documents too large to be legibly displayed within a computer screen. Initially, a window is provided within which only a portion of an entire document may be displayed legibly. A graphic representation of the entire document is then exhibited within the window. A portion of the graphic representation of the entire document is displayed as a human discernable representation. A remaining portion of the graphic representation of the entire document is displayed as a compressed representation of a portion of the document. The compressed representation is iconic in nature such that a representation nearest the bottom and the top of the document, and furthest away from the human discernable portion, appears as increasingly iconic characters or graphics.