Additional Syntax
One of the most powerful features SuperCard adds to the HyperTalk language is user properties. Where HyperTalk had a fixed set of properties on its objects, SuperCard scripters can use the define property propName command to add new properties to buttons and fields. These properties can contain arbitrary text (including numbers and object references, which are also represented using text in xTalks), and even dumps of entire files.
SuperTalk provides several variations on HyperTalk's answer and answer file commands, which let one choose several items from a list, choose an icon from all available icons, pick a MIDI instrument to play sound with, or choose a file of a supported image format (including a preview), or disks and folders. Different from HyperTalk's dialogs, SuperTalk answer and ask dialogs do not all resize dynamically to hold more text. However, since SuperCard allows having cards (i.e. "pages") in windows of arbitrary types, one can easily build one's own dialog that is large enough. SuperTalk also has an alert command that displays standard system alert windows and sheets, including standard system icons.
A switch command is available for more readability in complex conditionals, and various types of media can be recorded (e.g. screen grabs of a card, sound and QuickTime movies). There is also a clone command that is equivalent to copying and pasting but leaves the clipboard unchanged, an enumeration command that creates global variables with sequential integer values, and recently MetaCard's familiar repeat for each item x command for iterating through lists was added.
SuperCard also offers exception handling using a try statement with associated throw command.
Read more about this topic: Super Talk, Extensions To The HyperTalk Base Language
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