ptlib: ptlib (Portable Tools Library) ptlib: ptlib: ptlib is a moderately large C++ class library that originated many ptlib: years ago as a method to produce applications that run on both ptlib: Microsoft Windows and Unix X-Windows systems. ptlib has an emphasised ptlib: focus on its networking, I/O portability, multi-threading and ptlib: portability, and is used to create high performance and highly ptlib: portable network-centric applications. ptlib is licensed under the ptlib: Mozilla Public License (MPL). ptlib: ptlib: ptlib: