Unique Features of OMO
OMO had the unique distinction of not only its stacks being cross-platform, but also its external libraries (XCMDs). For that purpose, a small subset of the Mac OS memory management commands (Handles) were ported to other platforms. In addition, OMO sported a modular design where every type of object was actually implemented as a plugin file in an "Objects" folder.
OMO's object types included both the standard controls available in other HyperCard clones of the time (buttons, text fields, draw and paint graphics), as well as more complex controls like a spreadsheet field, and non-control items that could be placed on a card but were invisible at runtime, like timers that could be scheduled to send messages after a specified time.
Read more about this topic: Oracle Media Objects
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