Many contemporanj user oriented applications require a combination of attributes from both window and forms management systems. PANES was developed as a tool to fill this niche by providing a simple, yet flexible tool for both the moderately trained, as well as the more sophisticated programmer, while allowing the development of user friendly, modeless application software.The development ofa highly interactive, information modeling system [8] necessitated the selection or construction ofa user interface development tool (UIDT). Like many current applications, this modeling system processes symbolic expressions and text as well as traditional data. Further, the UIDT must address command and control protocols in such a vi^ay that user interfaces can be customized for particular applications, A search of the literature and available products uncovered several UIDT alternatives. These alternatives can he categorized in two groups: forms managers and window managers,
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