The system operates in a largely stateless fashion, with no need to "save" during operation. Such changes are immediately saved when complete, so typing into a field caused that text to be stored to the stack's physical file. Instead, the state of any object in the system was considered to be live and editable at any time from the HyperCard runtime's perspective, there was no difference between moving a text field on the card and typing into it, both operations simply changed the state of the target object within the stack. The database did not exist as a separate system within the HyperCard stack, that is, there was no database engine or similar construct. The database features of the HyperCard system are based on the storage of the state of all of the objects on the cards in the physical file representing the stack. The layout engine was similar in concept to a "form" as used in most rapid application development (RAD) environments (such as Borland Delphi or Visual Basic). This way a stack of cards with a common layout and functionality can be created. Additionally, HyperCard also included prototype or template cards known as "backgrounds" when new cards are created they can refer to one of these background cards, which causes all of the objects on the background to be copied onto the new card. They place GUI objects on the cards using an interactive layout engine based on a simple drag-and-drop interface.
Users build new stacks or modify existing ones by adding new cards. Users "browse" the stack by navigating from card to card, using built-in navigation features, a powerful search mechanism, or through user-created scripts. Each card contains a number of interactive objects, including text fields, check boxes, buttons, and similar common GUI elements. Cards hold data, just as they would in a rolodex. HyperCard is based on the concept of a "stack" of virtual "cards". It was withdrawn from sale in March 2004, although by then it had not been updated for many years.
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HyperCard was originally released in 1987 for $49.95 and was included for free with all new Macs sold at the time. Some HyperCard users employed it as a programming system for Rapid Application Development of applications and databases, others for building interactive applications with no database requirements, command and control systems, and many examples in the demoscene. This combination of features - simple form layout, database capabilities and ease of programming - led to widespread use in many different roles. HyperCard also features HyperTalk, a programming language for manipulating data and the user interface.
It combines database capabilities with a graphical, flexible, user-modifiable interface. HyperCard was an application program and programming tool for Apple Macintosh and Apple IIGS computers that was among the first successful hypermedia systems before the World Wide Web.
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