| Subject | English | Polish |
| comp., MS | base class library | biblioteka klas podstawowych (A library that contains base classes) |
| comp., MS | class library | biblioteka klas (A library of classes, interfaces, and value types that are included in .NET Framework. This library provides access to system functionality and is designed to be the foundation on which .NET Framework applications, components, and controls are built) |
| comp., MS | Microsoft Foundation Class Library | biblioteka MFC (A library of C++ classes that forms an object-oriented wrapper around large portions of the Windows API and provides a framework on which to build applications) |
| comp., MS | .NET Framework class library | biblioteka klas programu .NET Framework (A library of classes, interfaces, and value types that are included in .NET Framework. This library provides access to system functionality and is designed to be the foundation on which .NET Framework applications, components, and controls are built) |