PTLib is a moderately large C++ class library that originated many years ago as a method to produce applications that run on both Microsoft Windows and Unix X-Windows systems. It also was to have a Macintosh port as well, but this never eventuated. In those days it was called the PWLib the Portable Windows Library. Since then, the availability of multi-platform GUI toolkits such as KDE and wxWindows, and the development of the OpenH323 and OPAL projects as primary user of the library, has emphasised the focus on networking, I/O portability, multi-threading and protocol portability. Mostly, the library is used to create high performance and highly portable network-centric applications. So all the GUI abstractions ahave been dropped and it was renamed the Portable Tools Library that you see today.
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