1. A method of providing an object-oriented structure to a selected computer system having a first operating system, comprising: providing a library of classes to the selected compouter system; developing the object-oriented structure, having a plurality of inter-relations among a plurality of selected objects, on a second computer system having a second operating system different from said first operating system; archiving the inter-relations among the selected objects in the object-oriented structure to provide a portable object document; providing said portable object document to the selected computer system; and constructing, within the selected computer system, said object-oriented structure, by instantiating the selected objects from among the classes in said library, and forming inter-relations among the instantiated objects in accordance with said portable object document.