User libraries are shared-object libraries (files with the platform-dependent extension .so, .sl or .dll) containing one or more user functions and a library registration function. They are created by compiling and linking these functions. Each user library that has been attached to STAR-CCM+ will have a node in the simulation tree, which has its own properties and pop-up menu.
The Language of the library is deduced from the library registration function. It represents the style of binding which the library functions require, not necessarily their language. For example, C++ functions will bind like C.