Libraries and Packages Index
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This section describes how to create static and dynamically loadable libraries in Delphi.
Note: Libraries are significantly more limited than packages in what they can export. Libraries cannot export constants, types, and normal variables. That is, class types defined in a library will not be seen in a program using that library.
To export items other than simple procedures and functions, packages are the recommended alternative. Libraries should only be considered when interoperability with other programming is a requirement.