## 18.3. Shared Libraries

The shared library concept enables you to link to user subroutines during a CFX-Solver run and avoids the need to create custom binaries each time user subroutines are used to extend the functionality of CFX. They also have advantage that:

- Different applications can reuse the same common library or set of libraries.

- One application can use several libraries or alternative libraries.

As has been shown in the previous sections, both user CEL functions and junction box routines declared in the CCL file must specify a library name, a unique calling name and a path to the shared library.

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