The Object Windows Library (OWL) is a Borland C++ object-oriented framework originally designed for Windows API. It was used in Turbo Pascal for Windows, Borland Pascal and their Borland C++ package. It was a competitor to the Microsoft Foundation Class Library (MFC).
OWL had incomplete support by the Borland C++ IDE and wasn't always upwardly compatible from release to release. It was eventually deprecated in favor of the Visual Component Library (VCL), which is written in Object Pascal and included in Delphi and C++ Builder Studios.
An open source internet community has released OWLNext, a series of improvements and patches to the original OWL which also allows newer compilers (Borland C++ Builder 5–6, GCC, Microsoft Visual C++ 6, 2003–2010, BDS C++ 2006, CodeGear C++ 2007–2010).
Read more about Object Windows Library: History, Features, Advantages, Disadvantages, OWLNext, Versions (non-exhaustive List)
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